410 Area Code in Maryland, United States
Description
Area code 410 covers much of eastern Maryland, including Baltimore, Annapolis, and the Eastern Shore. It was created in 1991 from a split of the original 301 area code, and in 1997, overlay code 443 was introduced, followed by 667 in 2012. The 410 region includes major historical and cultural landmarks, including the U.S. Naval Academy, Inner Harbor, and Johns Hopkins University. It serves a population dense with government, healthcare, and port-related industries. Despite the overlays, 410 remains the most iconic and recognizable area code in Maryland. It is frequently used in music, business names, and as a symbol of Baltimore pride.
Time & Time Zone
Time zone:
Eastern (GMT -05:00) Current time:
Map
Major Cities
| City | Prefixes |
|---|---|
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Counties
| County | Prefixes |
|---|---|
| Baltimore City | |
| Baltimore | |
| Anne Arundel | |
| Howard | |
| Harford | |
| Carroll | |
| Wicomico | |
| Worcester | |
| Prince Georges | |
| Cecil | |
| Queen Annes | |
| Talbot | |
| Caroline | |
| Dorchester | |
| Calvert | |
| Kent | |
| Frederick | |
| Somerset | |
| Montgomery |
Telephone Carriers
| Carrier | Type | Prefixes (%) |
|---|---|---|
| Verizon Maryland Inc | Landline | 83% |
| Cellco Partnership Dba Verizon Wireless Md | Wireless | 3% |
| New Cingular Wireless Pcs Llc Dc | Wireless | 3% |
| Teleport Communications America Llc Md | Landline | 2% |
| Mcimetro Access Transmission Services Llc | Landline | 2% |
| Sprint Spectrum L P | Wireless | 2% |
| Usa Mobility Wireless Inc | Wireless | 1% |
| Tw Telecom Of Maryland Llc Md | Landline | 1% |
| Baltimore Washington Telephone Bwt | Landline | < 1% |
| Ctc Communications Corp Md | Landline | < 1% |
| At T Local | Landline | < 1% |
| Peerless Network Of Maryland Llc | Landline | < 1% |
| Aquis Communications Inc | Wireless | < 1% |
| Sprint Communications Company L P Md | Landline | < 1% |
| Cavalier Telephone Llc Mid Atlantic Md | Landline | < 1% |
| Idt America Corp Md | Landline | < 1% |
| Comcast Phone Of Northern Maryland Inc Md | Landline | < 1% |
| Armstrong Telephone Co Of Maryland | Landline | < 1% |
| Paetec Communications Inc Md | Landline | < 1% |
| Cavalier Telephone Mid Atlantic Llc Md | Landline | < 1% |
| Halo Wireless Services Inc | Wireless | < 1% |
| Omnipoint Communications Cap Operations Llc | Wireless | < 1% |
| Broadview Networks Inc Md | Wireless | < 1% |
| Core Communications Inc Md | Wireless | < 1% |
| Mcc Telephony Of The Mid Atlantic Llc Md | Landline | < 1% |
| Sprint Spectrum L P Md | Wireless | < 1% |
| Bandwidth Com Clec Llc Md | Wireless | < 1% |
| Armstrong Telecommunications Inc Md | Wireless | < 1% |
| Level 3 Communications Llc Md | Landline | < 1% |
| Redi Call Communications Co | Wireless | < 1% |
| Atx Telecommunications Services Ltd | Landline | < 1% |
| Mci Worldcom Communications Inc Md | Landline | < 1% |
| Lightwave Communications Llc Md | Landline | < 1% |
| Quantum Telecommunications Inc Md | Landline | < 1% |
Prefixes
| Prefix | City | Carrier | Type |
|---|---|---|---|
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Linthicum Heights | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Havre De Grace | Verizon Maryland, Inc. | Landline | |
| Marydel | Verizon Maryland, Inc. | Landline | |
| Hanover | Verizon Maryland, Inc. | Landline | |
| Columbia | Verizon Maryland, Inc. | Landline | |
| Severn | Verizon Maryland, Inc. | Landline | |
| Eden | Verizon Maryland, Inc. | Landline | |
| Hanover | Tw Telecom of Maryland Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Delmar | Verizon Maryland, Inc. | Landline | |
| Rosedale | Verizon Maryland, Inc. | Landline | |
| Halethorpe | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Pylesville | Verizon Maryland, Inc. | Landline | |
| Randallstown | Verizon Maryland, Inc. | Landline | |
| Hebron | Verizon Maryland, Inc. | Landline | |
| Church Creek | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Aberdeen | Verizon Maryland, Inc. | Landline | |
| Odenton | Verizon Maryland, Inc. | Landline | |
| Rosedale | Verizon Maryland, Inc. | Landline | |
| Mount Airy | Verizon Maryland, Inc. | Landline | |
| Earleville | Verizon Maryland, Inc. | Landline | |
| Elkridge | Verizon Maryland, Inc. | Landline | |
| Glen Arm | Verizon Maryland, Inc. | Landline | |
| North East | Verizon Maryland, Inc. | Landline | |
| Edgewater | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Rock Hall | Verizon Maryland, Inc. | Landline | |
| Elkton | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Towson | Comcast Phone of Northern Maryland, Inc. - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Hydes | Verizon Maryland, Inc. | Landline | |
| Brooklyn | Verizon Maryland, Inc. | Landline | |
| Henderson | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Parsonsburg | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Laurel | Verizon Maryland, Inc. | Landline | |
| Havre De Grace | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Glenelg | Verizon Maryland, Inc. | Landline | |
| Wye Mills | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Reisterstown | Verizon Maryland, Inc. | Landline | |
| Monkton | Verizon Maryland, Inc. | Landline | |
| Hillsboro | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Tracys Landing | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Laurel | Verizon Maryland, Inc. | Landline | |
| Dundalk | Verizon Maryland, Inc. | Landline | |
| Street | Verizon Maryland, Inc. | Landline | |
| Forest Hill | Verizon Maryland, Inc. | Landline | |
| Delmar | Verizon Maryland, Inc. | Landline | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Randallstown | Verizon Maryland, Inc. | Landline | |
| Ocean City | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Essex | Verizon Maryland, Inc. | Landline | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Crofton | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Rock Hall | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Westminster | Verizon Maryland, Inc. | Landline | |
| Preston | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Elkton | Verizon Maryland, Inc. | Landline | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Queen Anne | At&t Local | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Clarksville | Verizon Maryland, Inc. | Landline | |
| Lutherville Timonium | Verizon Maryland, Inc. | Landline | |
| Dowell | Verizon Maryland, Inc. | Landline | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Bel Air | Verizon Maryland, Inc. | Landline | |
| Davidsonville | Verizon Maryland, Inc. | Landline | |
| Riva | Verizon Maryland, Inc. | Landline | |
| Cecilton | Verizon Maryland, Inc. | Landline | |
| Catonsville | Sprint Spectrum L.p. | Wireless | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Westover | Verizon Maryland, Inc. | Landline | |
| Lusby | Verizon Maryland, Inc. | Landline | |
| Centreville | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Woodstock | Verizon Maryland, Inc. | Landline | |
| Linthicum Heights | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Glyndon | Mcimetro Access Transmission Services Llc | Landline | |
| Street | Verizon Maryland, Inc. | Landline | |
| Reisterstown | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Laurel | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Bivalve | Verizon Maryland, Inc. | Landline | |
| Rosedale | Verizon Maryland, Inc. | Landline | |
| Madison | Verizon Maryland, Inc. | Landline | |
| North East | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Finksburg | Verizon Maryland, Inc. | Landline | |
| Willards | Verizon Maryland, Inc. | Landline | |
| Reisterstown | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Henderson | Verizon Maryland, Inc. | Landline | |
| Federalsburg | Verizon Maryland, Inc. | Landline | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Street | Verizon Maryland, Inc. | Landline | |
| Parkville | Comcast Phone of Northern Maryland, Inc. - Md | Landline | |
| Aberdeen Proving Ground | Verizon Maryland, Inc. | Landline | |
| Odenton | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Pikesville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Hunt Valley | Verizon Maryland, Inc. | Landline | |
| Claiborne | Verizon Maryland, Inc. | Landline | |
| Towson | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Phoenix | Verizon Maryland, Inc. | Landline | |
| Annapolis | Usa Mobility Wireless, Inc. | Wireless | |
| Trappe | Verizon Maryland, Inc. | Landline | |
| Salisbury | Verizon Maryland, Inc. | Landline | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Fulton | Verizon Maryland, Inc. | Landline | |
| Columbia | Verizon Maryland, Inc. | Landline | |
| Woodbine | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Conowingo | Armstrong Telephone Co. of Maryland | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Arnold | Verizon Maryland, Inc. | Landline | |
| Reisterstown | Verizon Maryland, Inc. | Landline | |
| Millersville | Verizon Maryland, Inc. | Landline | |
| Kingsville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Gambrills | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Hampstead | Verizon Maryland, Inc. | Landline | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Columbia | Teleport Communications America, Llc - Md | Landline | |
| Pikesville | Verizon Maryland, Inc. | Landline | |
| Columbia | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Severn | Verizon Maryland, Inc. | Landline | |
| Salisbury | Verizon Maryland, Inc. | Landline | |
| Broomes Island | Verizon Maryland, Inc. | Landline | |
| Baltimore | Usa Mobility Wireless, Inc. | Wireless | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Whiteford | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Easton | Sprint Spectrum L.p. | Wireless | |
| Worton | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Rising Sun | Verizon Maryland, Inc. | Landline | |
| Easton | Verizon Maryland, Inc. | Landline | |
| Abingdon | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Brooklyn | Verizon Maryland, Inc. | Landline | |
| Galena | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Keymar | Verizon Maryland, Inc. | Landline | |
| Huntingtown | Verizon Maryland, Inc. | Landline | |
| Reisterstown | Verizon Maryland, Inc. | Landline | |
| Halethorpe | Usa Mobility Wireless, Inc. | Wireless | |
| Pylesville | Verizon Maryland, Inc. | Landline | |
| Laurel | Verizon Maryland, Inc. | Landline | |
| Hebron | Cavalier Telephone, Llc (mid-atlantic) - Md | Landline | |
| Huntingtown | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Gambrills | Verizon Maryland, Inc. | Landline | |
| Halethorpe | Verizon Maryland, Inc. | Landline | |
| Salisbury | Aquis Communications, Inc. | Wireless | |
| Chase | Verizon Maryland, Inc. | Landline | |
| Finksburg | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Ocean City | Verizon Maryland, Inc. | Landline | |
| Halethorpe | Tw Telecom of Maryland Llc - Md | Landline | |
| Pikesville | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Tracys Landing | Verizon Maryland, Inc. | Landline | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Parsonsburg | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Finksburg | Verizon Maryland, Inc. | Landline | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Bel Air | Verizon Maryland, Inc. | Landline | |
| Fruitland | Verizon Maryland, Inc. | Landline | |
| Chesapeake City | Mcimetro Access Transmission Services Llc | Landline | |
| Hanover | Verizon Maryland, Inc. | Landline | |
| Preston | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Butler | Verizon Maryland, Inc. | Landline | |
| Hebron | Verizon Maryland, Inc. | Landline | |
| Lutherville Timonium | Verizon Maryland, Inc. | Landline | |
| Curtis Bay | Verizon Maryland, Inc. | Landline | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Fort Howard | Verizon Maryland, Inc. | Landline | |
| Baltimore | Usa Mobility Wireless, Inc. | Wireless | |
| Sherwood | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Westminster | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Sudlersville | Verizon Maryland, Inc. | Landline | |
| Lutherville Timonium | Verizon Maryland, Inc. | Landline | |
| Hanover | Verizon Maryland, Inc. | Landline | |
| Conowingo | Verizon Maryland, Inc. | Landline | |
| Annapolis | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Jarrettsville | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Pikesville | Verizon Maryland, Inc. | Landline | |
| Berlin | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Stevenson | Verizon Maryland, Inc. | Landline | |
| Glyndon | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Annapolis | Cellco Partnership Dba Verizon Wireless - Md | Landline | |
| Cockeysville | Teleport Communications America, Llc - Md | Landline | |
| Gambrills | Verizon Maryland, Inc. | Landline | |
| Woodstock | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Bel Air | Verizon Maryland, Inc. | Landline | |
| Aberdeen | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Crisfield | Verizon Maryland, Inc. | Landline | |
| Baltimore | Usa Mobility Wireless, Inc. | Wireless | |
| Hyattsville | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Rhodesdale | Verizon Maryland, Inc. | Landline | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Laurel | Tw Telecom of Maryland Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Laurel | Tw Telecom of Maryland Llc - Md | Landline | |
| Laurel | Verizon Maryland, Inc. | Landline | |
| Forest Hill | Verizon Maryland, Inc. | Landline | |
| Freeland | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Rosedale | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Aberdeen | Verizon Maryland, Inc. | Landline | |
| Barclay | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Catonsville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Delmar | Verizon Maryland, Inc. | Landline | |
| Severn | Verizon Maryland, Inc. | Landline | |
| Laurel | Tw Telecom of Maryland Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Annapolis | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Hanover | Verizon Maryland, Inc. | Landline | |
| Salisbury | Level 3 Communications, Llc - Md | Landline | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Linthicum Heights | Verizon Maryland, Inc. | Landline | |
| Severna Park | Verizon Maryland, Inc. | Landline | |
| Gambrills | Verizon Maryland, Inc. | Landline | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Teleport Communications America, Llc - Md | Wireless | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Curtis Bay | Verizon Maryland, Inc. | Landline | |
| Trappe | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| West Friendship | Verizon Maryland, Inc. | Landline | |
| Queenstown | Idt America Corp - Md | Landline | |
| White Marsh | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Owings Mills | Verizon Maryland, Inc. | Landline | |
| Lanham | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Rosedale | Verizon Maryland, Inc. | Landline | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Linthicum Heights | Sprint Spectrum L.p. | Wireless | |
| Severna Park | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Mcimetro Access Transmission Services Llc | Landline | |
| Phoenix | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Betterton | Verizon Maryland, Inc. | Landline | |
| Elkridge | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| White Marsh | Sprint Spectrum L.p. | Wireless | |
| Stevensville | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Forest Hill | Verizon Maryland, Inc. | Landline | |
| Hunt Valley | Mcimetro Access Transmission Services Llc | Landline | |
| Marriottsville | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Wireless | |
| Columbia | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Severn | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Essex | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Parsonsburg | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Silver Spring | Usa Mobility Wireless, Inc. | Wireless | |
| Abingdon | Verizon Maryland, Inc. | Landline | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Hunt Valley | Mci Worldcom Communications, Inc. - Md | Landline | |
| Parsonsburg | Verizon Maryland, Inc. | Landline | |
| Sykesville | Teleport Communications America, Llc - Md | Landline | |
| Columbia | Verizon Maryland, Inc. | Landline | |
| Towson | Mcimetro Access Transmission Services Llc | Landline | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Edgewood | Verizon Maryland, Inc. | Landline | |
| Middle River | Verizon Maryland, Inc. | Landline | |
| Sparrows Point | Verizon Maryland, Inc. | Landline | |
| Sykesville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Owings Mills | Mci Worldcom Communications, Inc. - Md | Landline | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Easton | Level 3 Communications, Llc - Md | Landline | |
| Catonsville | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Arnold | Verizon Maryland, Inc. | Landline | |
| Pikesville | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Joppa | Verizon Maryland, Inc. | Landline | |
| Lutherville Timonium | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Monkton | Verizon Maryland, Inc. | Landline | |
| Severna Park | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Owings Mills | Mcimetro Access Transmission Services Llc | Landline | |
| Chesapeake Beach | Verizon Maryland, Inc. | Landline | |
| Arnold | Verizon Maryland, Inc. | Landline | |
| Forest Hill | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Perryville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Ocean City | Verizon Maryland, Inc. | Landline | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Monkton | Verizon Maryland, Inc. | Landline | |
| Finksburg | Mcimetro Access Transmission Services Llc | Landline | |
| Elkridge | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Phoenix | Verizon Maryland, Inc. | Landline | |
| Laurel | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Owings Mills | Verizon Maryland, Inc. | Landline | |
| Warwick | Verizon Maryland, Inc. | Landline | |
| Columbia | Verizon Maryland, Inc. | Landline | |
| Denton | Verizon Maryland, Inc. | Landline | |
| Millersville | Verizon Maryland, Inc. | Landline | |
| Hanover | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Lutherville Timonium | Verizon Maryland, Inc. | Landline | |
| Laurel | Tw Telecom of Maryland Llc - Md | Landline | |
| Baltimore | Core Communications, Inc. - Md | Wireless | |
| Reisterstown | Verizon Maryland, Inc. | Landline | |
| Lutherville Timonium | Teleport Communications America, Llc - Md | Landline | |
| Columbia | Usa Mobility Wireless, Inc. | Wireless | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Mardela Springs | Verizon Maryland, Inc. | Landline | |
| Owings Mills | Cavalier Telephone Mid-atlantic, Llc - Md | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Crofton | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Randallstown | Verizon Maryland, Inc. | Landline | |
| Woodbine | Verizon Maryland, Inc. | Landline | |
| Windsor Mill | Teleport Communications America, Llc - Md | Landline | |
| Essex | Usa Mobility Wireless, Inc. | Wireless | |
| Elkton | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Cockeysville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Pikesville | Verizon Maryland, Inc. | Landline | |
| Westminster | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| East New Market | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Salisbury | Idt America Corp - Md | Wireless | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Salisbury | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Lutherville Timonium | Verizon Maryland, Inc. | Landline | |
| Woodstock | Verizon Maryland, Inc. | Landline | |
| Aberdeen | Verizon Maryland, Inc. | Landline | |
| Chester | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Owings Mills | Verizon Maryland, Inc. | Landline | |
| Snow Hill | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Mcimetro Access Transmission Services Llc | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Forest Hill | Verizon Maryland, Inc. | Landline | |
| Forest Hill | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Edgewater | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Easton | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Ellicott City | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Forest Hill | Verizon Maryland, Inc. | Landline | |
| Catonsville | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Trappe | Verizon Maryland, Inc. | Landline | |
| Catonsville | Verizon Maryland, Inc. | Landline | |
| Rockville | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Stevensville | Verizon Maryland, Inc. | Landline | |
| Eden | Verizon Maryland, Inc. | Landline | |
| Elkridge | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Ocean City | Verizon Maryland, Inc. | Landline | |
| Pikesville | Verizon Maryland, Inc. | Landline | |
| Bel Air | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Churchville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Huntingtown | Verizon Maryland, Inc. | Landline | |
| Baltimore | Baltimore-washington Telephone Bwt | Landline | |
| Westminster | Verizon Maryland, Inc. | Landline | |
| Severn | Sprint Spectrum L.p. | Wireless | |
| Pylesville | Verizon Maryland, Inc. | Landline | |
| Arnold | Verizon Maryland, Inc. | Landline | |
| Lusby | Verizon Maryland, Inc. | Landline | |
| Woolford | Verizon Maryland, Inc. | Landline | |
| Berlin | Sprint Communications Company, L.p. - Md | Landline | |
| Savage | Baltimore-washington Telephone Bwt | Landline | |
| Elkridge | Usa Mobility Wireless, Inc. | Wireless | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Perryville | Verizon Maryland, Inc. | Landline | |
| Prince Frederick | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Gambrills | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Rosedale | Sprint Spectrum L.p. | Wireless | |
| Laurel | Verizon Maryland, Inc. | Landline | |
| Linkwood | Verizon Maryland, Inc. | Landline | |
| Elkridge | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Odenton | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Curtis Bay | Tw Telecom of Maryland Llc - Md | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Centreville | Verizon Maryland, Inc. | Landline | |
| Middle River | Verizon Maryland, Inc. | Landline | |
| Reisterstown | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Owings Mills | Verizon Maryland, Inc. | Landline | |
| Columbia | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Edgewood | Verizon Maryland, Inc. | Landline | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Easton | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Showell | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Riva | Verizon Maryland, Inc. | Landline | |
| Berlin | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Teleport Communications America, Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Curtis Bay | Verizon Maryland, Inc. | Landline | |
| Westminster | Verizon Maryland, Inc. | Landline | |
| Conowingo | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Elkridge | Verizon Maryland, Inc. | Wireless | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Annapolis | Paetec Communications, Inc. - Md | Landline | |
| Lutherville Timonium | Verizon Maryland, Inc. | Landline | |
| Worton | Sprint Spectrum L.p. | Wireless | |
| Laurel | Tw Telecom of Maryland Llc - Md | Landline | |
| White Hall | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Salisbury | Redi-call Communications Co | Wireless | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Rock Hall | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Upper Falls | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Westminster | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mci Worldcom Communications, Inc. - Md | Landline | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Columbia | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Pikesville | Verizon Maryland, Inc. | Landline | |
| Westover | Verizon Maryland, Inc. | Landline | |
| Catonsville | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Lutherville Timonium | Verizon Maryland, Inc. | Landline | |
| Edgewood | Mcimetro Access Transmission Services Llc | Landline | |
| Easton | Mci Worldcom Communications, Inc. - Md | Landline | |
| Churchville | Cavalier Telephone, Llc (mid-atlantic) - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Ocean City | Verizon Maryland, Inc. | Landline | |
| Deal Island | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Cambridge | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Aberdeen | Verizon Maryland, Inc. | Landline | |
| Brooklyn | Verizon Maryland, Inc. | Landline | |
| Greensboro | Verizon Maryland, Inc. | Landline | |
| Windsor Mill | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Columbia | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Cavalier Telephone Mid-atlantic, Llc - Md | Landline | |
| Baltimore | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Wireless | |
| Middle River | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Elkton | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Halethorpe | Tw Telecom of Maryland Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Pasadena | Verizon Maryland, Inc. | Landline | |
| Ocean City | Verizon Maryland, Inc. | Landline | |
| Easton | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Salisbury | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Huntingtown | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Millersville | Mcimetro Access Transmission Services Llc | Landline | |
| Cambridge | Mcimetro Access Transmission Services Llc | Landline | |
| Severna Park | Armstrong Telecommunications, Inc. - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Edgewater | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Landline | |
| Baltimore | Landline | ||
| Annapolis | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Pikesville | Bandwidth.com Clec, Llc - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Salisbury | Mci Worldcom Communications, Inc. - Md | Wireless | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Princess Anne | Verizon Maryland, Inc. | Landline | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Hyattsville | Landline | ||
| Finksburg | Verizon Maryland, Inc. | Landline | |
| Westminster | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Sykesville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Forest Hill | Cavalier Telephone, Llc (mid-atlantic) - Md | Landline | |
| Owings Mills | Verizon Maryland, Inc. | Landline | |
| Windsor Mill | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Edgewood | Teleport Communications America, Llc - Md | Landline | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Union Bridge | Halo Wireless Services, Inc. | Wireless | |
| Tracys Landing | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Baltimore-washington Telephone Bwt | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Belcamp | Verizon Maryland, Inc. | Landline | |
| Millersville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Baltimore-washington Telephone Bwt | Landline | |
| Elkridge | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Oxford | Verizon Maryland, Inc. | Landline | |
| Annapolis | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Bel Air | Verizon Maryland, Inc. | Landline | |
| Belcamp | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Pikesville | Teleport Communications America, Llc - Md | Landline | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Fallston | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Elkton | Verizon Maryland, Inc. | Landline | |
| Parkville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Denton | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Columbia | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Centreville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Ewell | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Lusby | Usa Mobility Wireless, Inc. | Wireless | |
| Hanover | Teleport Communications America, Llc - Md | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Elkridge | Usa Mobility Wireless, Inc. | Wireless | |
| Halethorpe | Lightwave Communications, Llc - Md | Landline | |
| Linthicum Heights | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Lutherville Timonium | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Owings Mills | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Ctc Communications Corp. - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Odenton | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Landline | ||
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Finksburg | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Taneytown | Verizon Maryland, Inc. | Landline | |
| Gwynn Oak | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Middle River | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Columbia | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Towson | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Baltimore-washington Telephone Bwt | Landline | |
| Westminster | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Easton | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Bowie | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Mci Worldcom Communications, Inc. - Md | Landline | |
| Baltimore | Quantum Telecommunications, Inc. - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Omnipoint Communications Cap Operations, Llc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Mci Worldcom Communications, Inc. - Md | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Level 3 Communications, Llc - Md | Landline | |
| Ocean City | Verizon Maryland, Inc. | Landline | |
| Crofton | Mcimetro Access Transmission Services Llc | Landline | |
| Finksburg | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Middle River | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Verizon Maryland, Inc. | Landline | |
| Crownsville | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcc Telephony of the Mid-atlantic, Llc - Md | Landline | |
| Annapolis | Atx Telecommunications Services, Ltd | Landline | |
| Baltimore | Teleport Communications America, Llc - Md | Landline | |
| Towson | Verizon Maryland, Inc. | Wireless | |
| Forest Hill | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Davidsonville | Verizon Maryland, Inc. | Wireless | |
| Whaleyville | Verizon Maryland, Inc. | Landline | |
| Catonsville | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Cavalier Telephone Mid-atlantic, Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cavalier Telephone Mid-atlantic, Llc - Md | Landline | |
| Bel Air | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Towson | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | Usa Mobility Wireless, Inc. | Wireless | |
| Fruitland | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Peerless Network of Maryland, Llc | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Sykesville | Sprint Spectrum L.p. - Md | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Edgewater | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Bel Air | Mcimetro Access Transmission Services Llc | Landline | |
| Cockeysville | Verizon Maryland, Inc. | Landline | |
| Salisbury | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Owings Mills | Sprint Spectrum L.p. | Wireless | |
| Belcamp | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Halethorpe | Broadview Networks, Inc. - Md | Wireless | |
| Salisbury | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Solomons | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Fork | Teleport Communications America, Llc - Md | Landline | |
| Denton | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Gwynn Oak | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Parkton | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Columbia | Teleport Communications America, Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Wireless | |
| Halethorpe | Verizon Maryland, Inc. | Wireless | |
| Pikesville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Annapolis | Mcimetro Access Transmission Services Llc | Landline | |
| Linthicum Heights | Verizon Maryland, Inc. | Wireless | |
| Glen Burnie | Verizon Maryland, Inc. | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| North East | Usa Mobility Wireless, Inc. | Wireless | |
| Bel Air | Sprint Spectrum L.p. | Wireless | |
| Hunt Valley | Bandwidth.com Clec, Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Laurel | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Nottingham | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Salisbury | Cellco Partnership Dba Verizon Wireless - Md | Landline | |
| Elkton | Verizon Maryland, Inc. | Landline | |
| Baltimore | Redi-call Communications Co | Wireless | |
| Randallstown | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Laurel | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Randallstown | Verizon Maryland, Inc. | Landline | |
| Salisbury | Redi-call Communications Co | Wireless | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Glen Burnie | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Aberdeen | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Annapolis | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Towson | Usa Mobility Wireless, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Fork | Mcimetro Access Transmission Services Llc | Landline | |
| Catonsville | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Curtis Bay | Verizon Maryland, Inc. | Wireless | |
| Sparks Glencoe | Verizon Maryland, Inc. | Landline | |
| Salisbury | Usa Mobility Wireless, Inc. | Wireless | |
| Finksburg | Verizon Maryland, Inc. | Landline | |
| Linthicum Heights | Verizon Maryland, Inc. | Landline | |
| Linthicum Heights | Verizon Maryland, Inc. | Landline | |
| West River | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Baltimore | Teleport Communications America, Llc - Md | Landline | |
| Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | |
| Hyattsville | Tw Telecom of Maryland Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Laurel | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Towson | Verizon Maryland, Inc. | Wireless | |
| Ellicott City | Tw Telecom of Maryland Llc - Md | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Catonsville | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Nottingham | New Cingular Wireless Pcs, Llc - Dc | Wireless | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Baltimore | Sprint Spectrum L.p. | Wireless | |
| Annapolis | Verizon Maryland, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Ellicott City | Usa Mobility Wireless, Inc. | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Randallstown | Usa Mobility Wireless, Inc. | Wireless | |
| Annapolis | Teleport Communications America, Llc - Md | Landline | |
| Baltimore | Mcimetro Access Transmission Services Llc | Landline | |
| Baltimore | Verizon Maryland, Inc. | Landline | |
| Elkridge | Sprint Spectrum L.p. | Wireless | |
| Towson | Mci Worldcom Communications, Inc. - Md | Landline |