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240 Area Code

State:Maryland
Major City:Germantown
Timezone:Eastern
Current Time:

History of area code 240

240 was first put in service June 1, 1997. It was created from area code 301. To avoid exhausting all possible phone numbers in this area code, relief planning has begun.

Where is area code 240

Area code 240 is located in western Maryland and covers Germantown, Silver Spring, Waldorf, Frederick, and Rockville. It is an overlay for area code 301 and serves the same area.

What time zone is area code 240?

The 240 area code is located in the Eastern timezone. The Eastern time zone is also known as America/New_York

area code 240

240 area code map

Top 11 Counties in Area Code 240

CountyTotal Population% of 240% of County
Montgomery, MD971,77711%100%
Prince George's, MD863,42010%100%
Frederick, MD233,38514%96%
Washington, MD147,43010%100%
Charles, MD146,55113%100%
St. Mary's, MD105,15116%100%
Allegany, MD75,0879%100%
Howard, MD287,0851%24%
Anne Arundel, MD537,6561%7%
Garrett, MD30,09714%100%
Calvert, MD88,7371%8%

Top 50 Cities in Area Code 240

CityTotal Population% of 240% of City
Germantown, MD86,3950%100%
Silver Spring, MD71,4520%100%
Waldorf, MD67,7521%100%
Frederick, MD65,2390%100%
Rockville, MD61,2090%100%
Bethesda, MD60,8580%100%
Gaithersburg, MD59,9330%100%
Bowie, MD54,7270%100%
Aspen Hill, MD48,7590%100%
Wheaton, MD48,2840%100%
Potomac, MD44,9651%100%
North Bethesda, MD43,8280%100%
Hagerstown, MD39,6620%100%
Clinton, MD35,9701%100%
Olney, MD33,8440%100%
Chillum, MD33,5130%100%
Montgomery Village, MD32,0320%100%
College Park, MD30,4130%100%
South Laurel, MD26,1120%100%
Suitland, MD25,8250%100%
Laurel, MD25,1150%100%
North Potomac, MD24,4100%100%
Scaggsville, MD24,3330%100%
Fort Washington, MD23,7170%100%
Fairland, MD23,6810%100%
Landover, MD23,0780%100%
Greenbelt, MD23,0680%100%
Cumberland, MD20,8590%100%
Camp Springs, MD19,0960%100%
Langley Park, MD18,7550%100%
Ballenger Creek, MD18,2740%100%
Calverton, MD17,7240%100%
Oxon Hill, MD17,7220%100%
Hyattsville, MD17,5570%100%
White Oak, MD17,4030%100%
Seabrook, MD17,2870%100%
Glassmanor, MD17,2950%100%
Redland, MD17,2420%100%
Beltsville, MD16,7720%100%
Takoma Park, MD16,7150%100%
Hillcrest Heights, MD16,4690%100%
Maryland City, MD16,0930%100%
East Riverdale, MD15,5090%100%
Damascus, MD15,2570%100%
Cloverly, MD15,1260%100%
Adelphi, MD15,0860%100%
Colesville, MD14,6470%100%
Clarksburg, MD13,7660%100%
Glenmont, MD13,5290%100%
Glenn Dale, MD13,4660%100%

Largest Landline Carriers in area code240

PrefixesCarrier
9%Verizon
6%Xo
5%Peerless Network
4%Global Crossing Local Services
4%Broadwing
3%Cavalier East
3%Core
27%Other

Largest Wireless Carriers in area code240

PrefixesCarrier
14%Sprint
9%Verizon Wireless
7%Cingular
4%Omnipoint Cap Operations
2%Cricket Comm
1%United States Cel Md
1%365 Wireless
1%Other

Prefixes in area code240

PrefixUsagePrimary CityCarrierIntroduced
(240) 200-landlineMount RainierBandwidth.com10/04/2010
(240) 201-landlineRidgePeerless Network Of The District Of Columbia, DC07/22/1999
(240) 203-wirelessHagerstownSprint10/04/2011
(240) 204-wirelessBethesdaVerizon Wireless09/07/2011
(240) 205-wirelessCabin JohnCingular Wireless07/23/2003
(240) 206-landlineGlenn DaleXo Maryland10/31/2001
(240) 207-landlineDamascusCavalier East08/20/2000
(240) 208-landlineLa PlataPeerless Network Of The District Of Columbia, DC07/22/1999
(240) 209-landlineIndian HeadPeerless Network Of The District Of Columbia, DC07/22/1999
(240) 210-wirelessWaldorfCingular Wireless08/20/2000
(240) 212-landlineOaklandCore Comms06/13/2000
(240) 213-landlineWaldorfPeerless Network Of The District Of Columbia, DC07/22/1999
(240) 214-landlineMechanicsvillePeerless Network Of The District Of Columbia, DC07/22/1999
(240) 215-landlineFrederickTelcove Operations01/14/2000
(240) 216-wirelessWaldorfSprint03/15/2001
(240) 217-wirelessHagerstownOmnipoint Comms Cap Operations04/16/2001
(240) 218-landlineNanjemoyPeerless Network Of The District Of Columbia, DC02/27/1999
(240) 220-landlinePoolesvillePeerless Network02/27/1999
(240) 221-landlineRockville05/10/1999
(240) 222-landlineWaldorfCavalier Telephone Mid-atlantic08/20/2000
(240) 223-landlineMount RainierAllegiance Telecom02/27/1999
(240) 224-wirelessGaithersburgVerizon Wireless09/10/2012
(240) 225-landlineFrederickCore Comms06/13/2000
(240) 228-landlineLaurel11/20/1998
(240) 229-landlineWaldorfBroadwing Comms.07/22/1999
(240) 230-landlineHughesvilleGlobal Crossing Local Services05/10/1999
(240) 231-landlineHagerstownCore Comms06/13/2000
(240) 232-landlineMount RainierBroadwing Comms.07/22/1999
(240) 233-landlineNewburgTeleport Comms America02/27/1999
(240) 234-wirelessMount RainierVerizon Wireless10/04/2011
(240) 235-landlineBethesdaPaetec Comms10/13/1999
(240) 236-landlineFrederick06/13/2000
(240) 237-landlineCallawayTeleport Comms America02/27/1999
(240) 238-landlineRockvillePaetec Comms10/13/1999
(240) 239-landlineLeonardtownCore Comms10/31/2000
(240) 241-landlineChevy ChaseStarpower Comms02/27/1999
(240) 242-landlineKensingtonStarpower Comms02/27/1999
(240) 243-landlineGaithersburgAllegiance Telecom01/14/2000
(240) 244-landlineMount RainierStarpower Comms02/27/1999
(240) 245-landlineGlenn DaleStarpower Comms02/27/1999
(240) 246-landlineGaithersburgStarpower Comms11/20/1998
(240) 247-landlineMount RainierAllegiance Telecom02/27/1999
(240) 248-landlineRidgePeerless Network02/27/1999
(240) 249-landlineMechanicsvilleTeleport Comms America02/27/1999
(240) 250-landlineBrandywinePeerless Network02/27/1999
(240) 251-landlineHighfieldCore Comms06/13/2000
(240) 252-landlineGaithersburgLevel 3 Comms05/10/1999
(240) 253-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 254-landlineHughesvilleTeleport Comms America02/27/1999
(240) 255-landlinePoolesvillePeerless Network07/22/1999
(240) 256-landlineLeonardtownTeleport Comms America02/27/1999
(240) 257-landlineNanjemoyTeleport Comms America02/27/1999
(240) 258-landlineRidgeTeleport Comms America02/27/1999
(240) 260-landlineMount RainierAllegiance Telecom06/13/2000
(240) 262-wirelessCallawaySprint10/17/2011
(240) 263-wirelessBethesdaSprint11/10/2011
(240) 264-landlineBeltsville02/27/1999
(240) 265-wirelessBethesdaSprint11/10/2011
(240) 266-landlineMount RainierPeerless Network02/27/1999
(240) 268-landlineRockvilleAllegiance Telecom02/27/1999
(240) 269-landlineMount RainierPeerless Network02/27/1999
(240) 270-wirelessWaldorfVerizon Wireless11/07/2011
(240) 271-wirelessBethesdaCingular Wireless02/27/1999
(240) 272-wirelessBethesdaSprint11/10/2011
(240) 273-landlineMount RainierBroadwing Comms.07/22/1999
(240) 274-wirelessBethesdaCingular Wireless02/27/1999
(240) 275-landlineGrantsvilleCore Comms10/31/2000
(240) 276-landlineRockville05/04/2004
(240) 277-wirelessBethesdaSprint10/18/2002
(240) 278-wirelessLaurelVerizon Wireless07/08/2011
(240) 279-landlineWaldorfCore Comms10/31/2000
(240) 280-landlineLaurelComcast Phone Of Northern Maryland03/03/2001
(240) 281-wirelessBethesdaCingular Wireless10/13/1999
(240) 282-landlineMechanicsvillePeerless Network02/27/1999
(240) 283-landlineKensingtonPaetec Comms10/13/1999
(240) 284-landlineFrostburgLevel 3 Comms11/01/2004
(240) 285-landlineFrederickVerizon Wireless06/13/2000
(240) 286-wirelessBethesdaSprint09/17/2002
(240) 287-landlineHancockCore Comms06/13/2000
(240) 288-landlineThurmontComcast Phone Of Northern Maryland11/01/2004
(240) 289-landlineOxon HillCavalier Telephone Mid-atlantic08/20/2000
(240) 290-landlineMount RainierAllegiance Telecom02/27/1999
(240) 291-wirelessHagerstownCingular Wireless10/15/2002
(240) 292-landlineKensington10/13/1999
(240) 293-landlineMount RainierStarpower Comms02/27/1999
(240) 294-landlineLaurelXo Maryland06/30/2001
(240) 295-landlineLaurelCavalier Telephone Mid-atlantic08/20/2000
(240) 296-landlineHyattsvilleCavalier Telephone Mid-atlantic08/20/2000
(240) 297-landlineCollege ParkLevel 3 Comms10/13/1999
(240) 298-wirelessLeonardtownVerizon Wireless10/13/1999
(240) 299-wirelessWaldorfSprint10/13/1999
(240) 300-wirelessWaldorfVerizon Wireless12/07/2010
(240) 303-landlineClintonCavalier Telephone Mid-atlantic08/20/2000
(240) 304-wirelessMount RainierSprint07/03/2002
(240) 305-wirelessBeltsvilleSprint02/27/1999
(240) 306-landlineGaithersburgAllegiance Telecom06/13/2000
(240) 307-landlineEmmitsburgAT&T Local03/27/2003
(240) 308-wirelessDamascusCingular Wireless08/20/2000
(240) 309-wirelessLeonardtownVerizon Wireless09/10/2012
(240) 310-wirelessHagerstownUscoc Of Cumberland DBA United States Cel Md02/27/1999
(240) 312-landlineCapitol HeightsCavalier Telephone Mid-atlantic08/20/2000
(240) 313-landlineHagerstown10/31/2000
(240) 314-landlineRockville06/13/2000
(240) 315-landlineFrederick08/20/2000
(240) 316-wirelessChevy ChaseSprint
(240) 317-landlineCallawayStarpower Comms11/20/1998
(240) 318-landlineClinton01/14/2000
(240) 319-wirelessColumbiaVerizon Wireless06/06/2008
(240) 320-landlineWaldorfCavalier East10/31/2000
(240) 321-wirelessOaklandUscoc Of Cumberland DBA United States Cel Md02/27/1999
(240) 322-landlineMccooleCore Comms10/31/2000
(240) 323-landlineEmmitsburgCore Comms10/31/2000
(240) 324-landlineClarksvilleYmax Comms Corp.10/08/2008
(240) 325-landlineDamascusCore Comms10/31/2000
(240) 326-landlineUpper MarlboroCavalier Telephone Mid-atlantic08/20/2000
(240) 327-landlineGaithersburgCore Comms10/31/2000
(240) 328-landlineRockville08/20/2000
(240) 329-landlineHagerstownLevel 3 Comms10/31/2000
(240) 330-wirelessCabin JohnSprint12/14/2007
(240) 331-landlineMount RainierPeerless Network02/27/1999
(240) 332-landlineNewburgPeerless Network02/27/1999
(240) 333-landlineMount RainierCavalier East05/09/2001
(240) 334-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 335-landlineGlenn DaleCavalier Telephone Mid-atlantic08/20/2000
(240) 336-landlineBethesdaCore Comms10/31/2000
(240) 337-landlineMount RainierPeerless Network02/27/1999
(240) 338-wirelessSilver SpringVerizon Wireless01/14/2000
(240) 339-landlineUpper MarlboroCavalier East10/31/2000
(240) 340-wirelessBethesdaSprint08/18/2011
(240) 341-landlineAdamstownMci Worldcom Comms02/25/2009
(240) 342-landlineSandy SpringStarpower Comms11/20/1998
(240) 343-wirelessHancockVerizon Wireless05/10/2011
(240) 344-wirelessFrederickCingular Wireless10/15/2002
(240) 345-landlineSandy SpringLevel 3 Comms03/09/2006
(240) 346-wirelessWaldorfSprint08/20/2000
(240) 347-landlineHagerstownBandwidth.com08/04/2008
(240) 348-landlineOxon HillLevel 3 Comms08/20/2000
(240) 349-landlineLa PlataGlobal Crossing Local Services05/10/1999
(240) 350-wirelessBeltsvilleSprint05/10/1999
(240) 351-wirelessBeltsvilleSprint05/10/1999
(240) 352-landlineLa PlataPeerless Network02/27/1999
(240) 353-wirelessBeltsvilleSprint05/10/1999
(240) 354-wirelessBeltsvilleSprint05/10/1999
(240) 355-wirelessBeltsvilleSprint05/10/1999
(240) 356-landlineFrederickLevel 3 Comms03/03/2001
(240) 357-wirelessFrederickVerizon Wireless06/12/2006
(240) 358-landlineDamascusPeerless Network02/27/1999
(240) 359-landlineIndian HeadPeerless Network02/27/1999
(240) 360-wirelessLaurelOmnipoint Comms Cap Operations09/17/2013
(240) 361-landlineGaithersburgCavalier Telephone Mid-atlantic08/20/2000
(240) 362-landlineCumberland02/27/1999
(240) 363-landlineKensingtonGlobal Naps South02/27/1999
(240) 364-landlineGaithersburgCavalier East05/09/2001
(240) 365-landlineDamascusBaltimore-washington Telephone (bwt)08/20/2000
(240) 366-landlineWilliamsportAT&T Local03/03/2001
(240) 367-wirelessFrederickSprint10/18/2002
(240) 368-landlineWaldorfPeerless Network02/27/1999
(240) 369-landlineMount AiryCore Comms10/31/2000
(240) 370-wirelessBethesdaSprint12/14/2007
(240) 371-landlineMount RainierPeerless Network02/27/1999
(240) 372-wirelessGaithersburgSprint10/13/1999
(240) 373-landlineOdenton11/20/1998
(240) 374-landlineLaurelGlobal Crossing Local Services02/27/1999
(240) 375-wirelessCapitol HeightsSprint11/20/1998
(240) 376-landlineHughesvillePeerless Network02/27/1999
(240) 377-landlineIndian HeadGlobal Crossing Local Services05/10/1999
(240) 378-landlineCumberlandCore Comms10/31/2000
(240) 379-landlineFrederick03/03/2001
(240) 380-wirelessCabin JohnVerizon Wireless09/17/2007
(240) 381-wirelessSilver SpringCingular Wireless01/14/2000
(240) 382-landlineHagerstownTeleport Comms America06/11/2009
(240) 383-wirelessChevy ChaseCingular Wireless08/20/2000
(240) 384-landlineCallawayPeerless Network02/27/1999
(240) 385-landlineMyersville10/31/2000
(240) 386-landlineGaithersburg08/20/2000
(240) 387-landlineChevy ChaseCavalier East01/14/2000
(240) 388-wirelessGaithersburgSprint11/04/2002
(240) 389-landlineSandy SpringAtx Telecom Services, Ltd06/30/2001
(240) 390-landlineSandy SpringCavalier Telephone Mid-atlantic08/20/2000
(240) 391-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 392-landlineOxon HillStarpower Comms02/27/1999
(240) 393-wirelessCabin JohnVerizon Wireless06/13/2000
(240) 394-wirelessMount AiryCingular Wireless12/13/2004
(240) 395-landlineBethesdaCavalier Telephone Mid-atlantic08/20/2000
(240) 396-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 397-wirelessFrederickVerizon Wireless03/06/2009
(240) 398-wirelessCabin JohnSprint07/03/2002
(240) 399-landlineChevy ChaseXo Maryland10/13/1999
(240) 400-wirelessBethesdaSprint08/18/2011
(240) 401-wirelessRockvilleCingular Wireless11/20/1998
(240) 402-landlineCollege ParkMci Worldcom Comms09/21/2010
(240) 403-landlineRockvilleCavalier Telephone Mid-atlantic08/20/2000
(240) 404-landlineGaithersburgXo Maryland02/13/2001
(240) 405-landlineFrederickUs Lec07/27/2004
(240) 406-wirelessRockvilleLeap Wireless Intl DBA Cricket Comm09/17/2009
(240) 407-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 408-wirelessRockvilleLeap Wireless Intl DBA Cricket Comm10/14/2009
(240) 409-wirelessFrederickCingular Wireless02/27/1999
(240) 412-wirelessWaldorfSprint01/16/2001
(240) 413-wirelessHyattsvilleOmnipoint Comms Cap Operations03/12/2001
(240) 414-landlineMount RainierPeerless Network02/27/1999
(240) 415-landlineFrederickYmax Comms Corp.12/16/2008
(240) 416-wirelessWaldorfCingular Wireless05/18/2001
(240) 417-wirelessCapitol HeightsSprint03/03/2001
(240) 418-wirelessBeltsvilleSprint11/12/2001
(240) 419-wirelessWaldorfVerizon Wireless10/29/2007
(240) 420-landlineHagerstown07/22/1999
(240) 421-wirelessRockvilleOmnipoint Comms Cap Operations04/09/2001
(240) 422-wirelessFrederickOmnipoint Comms Cap Operations05/15/2002
(240) 423-wirelessSilver SpringOmnipoint Comms Cap Operations05/21/2001
(240) 424-wirelessMount RainierSprint11/16/2007
(240) 425-landlineCabin JohnDslnet Comms Va01/25/2001
(240) 426-wirelessBethesdaSprint10/25/2001
(240) 427-landlineWaldorfXo Maryland04/23/2001
(240) 428-landlineRockvilleBandwidth.com10/14/2009
(240) 429-wirelessSilver SpringVerizon Wireless12/19/2006
(240) 430-landlineKensingtonCavalier Telephone Mid-atlantic08/20/2000
(240) 431-wirelessTall TimbersSprint10/31/2000
(240) 432-wirelessBeltsvilleSprint02/27/1999
(240) 433-landlineSilver SpringCavalier Telephone Mid-atlantic08/20/2000
(240) 434-landlineLeonardtownBroadwing Comms.10/31/2000
(240) 435-wirelessWaldorfVerizon Wireless05/07/2009
(240) 436-landlineIjamsvilleTelcove Operations08/20/2000
(240) 437-landlineSandy SpringXo Maryland06/30/2001
(240) 438-wirelessSilver SpringSprint08/15/2011
(240) 439-wirelessFrederickVerizon Wireless06/06/2008
(240) 440-wirelessFrederickLeap Wireless Intl DBA Cricket Comm02/27/2009
(240) 441-wirelessOxon HillOmnipoint Comms Cap Operations06/06/2001
(240) 442-landlineOakland05/22/2001
(240) 444-wirelessLaurelVerizon Wireless09/07/2011
(240) 445-wirelessBethesdaSprint11/10/2011
(240) 446-wirelessFrederickVerizon Wireless08/09/2001
(240) 447-wirelessRockvilleCingular Wireless02/27/1999
(240) 448-wirelessWaldorfSprint09/07/2011
(240) 449-wirelessGaithersburgCingular Wireless03/03/2001
(240) 450-landlineSilver SpringCavalier Telephone Mid-atlantic08/20/2000
(240) 452-landlineHagerstownLumos Networks07/22/2010
(240) 453-landlineRockville11/20/1998
(240) 454-wirelessGaithersburgPaetec Comms04/22/2005
(240) 455-landlineOxon HillPaetec Comms06/20/2001
(240) 456-landlineLaurel08/20/2000
(240) 457-wirelessFrederickVerizon Wireless09/04/2008
(240) 458-wirelessWaldorfVerizon Wireless10/04/2011
(240) 459-wirelessLaurelVerizon Wireless07/27/2010
(240) 460-wirelessSilver SpringCingular Wireless07/22/1999
(240) 461-wirelessSilver SpringCingular Wireless07/22/1999
(240) 462-wirelessBeltsvilleSprint02/27/1999
(240) 463-wirelessSilver SpringCingular Wireless02/27/1999
(240) 464-landlineChevy ChaseSprint05/10/1999
(240) 465-landlineMount RainierPeerless Network02/27/1999
(240) 466-wirelessMechanicsvilleCingular Wireless10/31/2001
(240) 467-landlineOxon HillComcast Phone Of Northern Maryland04/25/2013
(240) 468-wirelessMount RainierSprint11/16/2007
(240) 469-wirelessHagerstownSprint02/14/2008
(240) 470-wirelessLaurelVerizon Wireless10/04/2011
(240) 471-landlineSilver SpringGlobal Crossing Local Services02/27/1999
(240) 472-wirelessSilver SpringCingular Wireless08/20/2000
(240) 473-landlineCollege ParkCavalier Telephone Mid-atlantic08/20/2000
(240) 475-wirelessSilver SpringCingular Wireless08/20/2000
(240) 476-wirelessSilver SpringOmnipoint Comms Cap Operations02/21/2001
(240) 477-landlineGaithersburgLightwave Comms05/20/2005
(240) 478-wirelessCabin JohnCingular Wireless07/27/2004
(240) 479-wirelessOxon HillVerizon Wireless04/07/2008
(240) 480-wirelessBethesdaSprint09/27/2010
(240) 481-wirelessSilver SpringOmnipoint Comms Cap Operations05/11/2001
(240) 482-landlineCabin JohnUs Lec01/14/2000
(240) 483-landlineOxon HillComcast Phone Of Northern Maryland10/31/2001
(240) 485-landlineCabin JohnUs Lec01/14/2000
(240) 486-wirelessGlenn DaleOmnipoint Comms Cap Operations03/12/2001
(240) 487-landlineHyattsvilleUs Lec01/14/2000
(240) 488-landlineOaklandShentel Comms05/16/2012
(240) 489-landlinePoolesvilleXo Maryland02/13/2001
(240) 490-wirelessMiddletownOmnipoint Comms Cap Operations06/12/2001
(240) 491-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 492-landlineCapitol HeightsUs Lec01/14/2000
(240) 493-landlineOxon HillUs Lec01/14/2000
(240) 494-landlineMount RainierCavalier East05/09/2001
(240) 495-wirelessMount RainierVerizon Wireless10/29/2013
(240) 497-landlineChevy Chase10/31/2000
(240) 498-wirelessBeltsvilleSprint10/31/2000
(240) 499-landlineCabin JohnUs Lec01/14/2000
(240) 500-landlineHagerstownUs Lec10/21/2010
(240) 501-wirelessSilver SpringSprint10/08/2001
(240) 502-wirelessSilver SpringSprint10/04/2011
(240) 503-landlineNewburgPeerless Network04/09/2013
(240) 504-wirelessSilver SpringSprint10/04/2011
(240) 505-wirelessSilver SpringOmnipoint Comms Cap Operations10/31/2001
(240) 506-wirelessRockvilleCingular Wireless01/09/2002
(240) 507-wirelessCabin JohnVerizon Wireless09/05/2008
(240) 508-wirelessCapitol HeightsSprint02/27/1999
(240) 509-landlineCroftonBandwidth.com03/31/2008
(240) 510-landlineUpper MarlboroXo Maryland10/31/2001
(240) 512-landlineCollege ParkCore Comms08/08/2006
(240) 513-wirelessHagerstownSprint10/19/2011
(240) 514-landlineCabin JohnUs Lec01/14/2000
(240) 515-wirelessBethesdaCingular Wireless06/20/2001
(240) 516-landlineSilver SpringUs Lec01/14/2000
(240) 518-wirelessWaldorfSprint10/21/2011
(240) 519-wirelessBethesdaSprint11/10/2011
(240) 520-wirelessHagerstownSprint03/29/2006
(240) 522-wirelessCumberlandSprint12/12/2001
(240) 523-landlineLa PlataXo Maryland02/13/2001
(240) 524-landlineLaurelPeerless Network02/27/1999
(240) 525-landlineUpper MarlboroPeerless Network02/27/1999
(240) 526-landlineLeonardtownPeerless Network02/27/1999
(240) 527-landlineHagerstown10/31/2000
(240) 528-landlineHughesvilleBroadwing Comms.10/31/2000
(240) 529-landlineFrederick10/31/2000
(240) 530-landlineWaldorfLocal Access08/01/2013
(240) 532-wirelessOxon HillVerizon Wireless10/29/2013
(240) 533-landlineMount RainierTeleport Comms America07/22/1999
(240) 535-wirelessSilver SpringCingular Wireless01/09/2001
(240) 536-landlineSandy SpringPeerless Network02/27/1999
(240) 538-landlineLeonardtownXo Maryland02/13/2001
(240) 539-landlineMount RainierPeerless Network02/27/1999
(240) 541-wirelessBethesdaSprint10/31/2011
(240) 542-landlineCollege ParkUs Lec01/14/2000
(240) 543-wirelessBethesdaSprint07/25/2006
(240) 544-landlineGlenn DaleUs Lec01/14/2000
(240) 545-landlineUpper MarlboroUs Lec01/14/2000
(240) 546-landlineClintonUs Lec01/14/2000
(240) 547-landlineLaurelLevel 3 Comms07/22/1999
(240) 548-landlineMount RainierAllegiance Telecom10/31/2000
(240) 550-wirelessRockvilleLeap Wireless Intl DBA Cricket Comm03/26/2009
(240) 551-wirelessRockvilleLeap Wireless Intl DBA Cricket Comm03/25/2009
(240) 552-wirelessRockvilleLeap Wireless Intl DBA Cricket Comm03/25/2009
(240) 553-landlineMount RainierAllegiance Telecom08/20/2000
(240) 554-landlineLaurelAllegiance Telecom10/31/2000
(240) 556-landlineGlenn DalePaetec Comms10/31/2001
(240) 558-landlineKensingtonCavalier Telephone Mid-atlantic06/30/2001
(240) 559-landlineSandy SpringAllegiance Telecom10/31/2000
(240) 560-landlineChevy ChaseXo Maryland04/23/2001
(240) 561-wirelessLeonardtownVerizon Wireless07/07/2008
(240) 565-wirelessLaurelOmnipoint Comms Cap Operations12/30/2005
(240) 566-landlineFrederick06/11/2002
(240) 567-landlineRockville07/12/2006
(240) 568-landlineLaurel07/22/1999
(240) 573-landlineUpper MarlboroGlobal Crossing Local Services07/22/1999
(240) 575-landlineFrederickLevel 3 Comms12/30/2005
(240) 577-wirelessLeonardtownVerizon Wireless08/09/2006
(240) 578-wirelessFrederickVerizon Wireless07/08/2011
(240) 580-wirelessCumberlandSprint06/14/2001
(240) 581-landlineLaurelPaetec Comms03/03/2001
(240) 582-landlineHyattsville07/22/1999
(240) 583-landlineBeltsville04/28/2010
(240) 585-wirelessWaldorfVerizon Wireless06/29/2011
(240) 586-landlineFrederick12/22/2006
(240) 587-wirelessLeonardtownVerizon Wireless07/06/2009
(240) 593-wirelessLaurelOmnipoint Comms Cap Operations03/13/2001
(240) 595-wirelessChevy ChaseVerizon Wireless09/13/2006
(240) 597-landlineGaithersburgPeerless Network02/27/1999
(240) 599-landlineRockvilleBroadwing Comms.07/22/1999
(240) 600-wirelessMount RainierSprint04/27/2011
(240) 601-wirelessBeltsvilleSprint07/22/1999
(240) 602-wirelessBeltsvilleSprint07/22/1999
(240) 603-wirelessBeltsvilleSprint07/22/1999
(240) 604-wirelessBeltsvilleSprint07/22/1999
(240) 605-wirelessBeltsvilleSprint07/22/1999
(240) 606-wirelessBeltsvilleSprint07/22/1999
(240) 607-landlineWaldorfGlobal Crossing Local Services05/10/1999
(240) 608-wirelessFrederick365 Wireless03/11/2013
(240) 612-landlineMount RainierTw Telecom08/04/2010
(240) 613-landlineHyattsvilleUs Lec04/05/2012
(240) 614-wirelessRockvilleMetro PCS07/16/2013
(240) 615-wirelessHyattsvilleMetro PCS05/29/2013
(240) 616-landlineCollege ParkMci Worldcom Comms06/30/2001
(240) 617-wirelessShentel Comms05/12/2014
(240) 619-landlineChevy ChaseMci Worldcom Comms08/20/2000
(240) 620-landlineRockvilleMci Worldcom Comms08/20/2000
(240) 621-landlineKensingtonMci Worldcom Comms08/20/2000
(240) 624-landlineGreenbelt06/13/2000
(240) 625-wirelessHagerstownSprint04/17/2001
(240) 626-wirelessFrederickSprint05/10/1999
(240) 627-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 629-landlineFrederick10/13/1999
(240) 630-landlineMount RainierBandwidth.com10/31/2011
(240) 631-landlineGaithersburg11/20/1998
(240) 632-landlineGaithersburg07/22/1999
(240) 638-landlineMount RainierBroadwing Comms.05/10/1999
(240) 640-wirelessWaldorfLeap Wireless Intl DBA Cricket Comm03/24/2009
(240) 643-wirelessSilver SpringOmnipoint Comms Cap Operations05/16/2002
(240) 644-landlineChevy ChaseXo Maryland10/31/2000
(240) 645-landlineChevy ChaseXo Maryland10/31/2000
(240) 646-landlineLaurelCavalier East10/13/1999
(240) 650-landlineCabin JohnBroadvox-clec11/17/2011
(240) 651-wirelessFrederickHalo Wireless Services11/28/2011
(240) 652-landlineMechanicsvilleXo Maryland02/13/2001
(240) 654-wirelessGaithersburgCingular Wireless05/19/2006
(240) 662-landlineSilver Spring01/14/2000
(240) 667-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 668-landlineDamascusStarpower Comms11/20/1998
(240) 669-landlineKensingtonComcast Phone Of Northern Maryland10/31/2000
(240) 670-landlineMount RainierLocal Access03/06/2012
(240) 671-wirelessMount RainierSprint10/31/2000
(240) 672-landlineRockvilleVerizon Wireless10/31/2000
(240) 674-wirelessFrederickSprint10/13/1999
(240) 675-wirelessMyersvilleCingular Wireless05/10/1999
(240) 676-wirelessSilver SpringVerizon Wireless02/27/1999
(240) 678-wirelessSilver SpringVerizon Wireless02/27/1999
(240) 682-landlineWaldorfStarpower Comms11/20/1998
(240) 683-landlineGaithersburg03/03/2001
(240) 684-landlineGreenbelt10/31/2000
(240) 685-landlineBrandywineGlobal Crossing Local Services05/10/1999
(240) 686-landlineGaithersburg03/03/2001
(240) 687-wirelessSilver SpringVerizon Wireless02/27/1999
(240) 688-wirelessSilver SpringVerizon Wireless06/12/2006
(240) 691-landlineMount RainierGlobal Crossing Local Services02/27/1999
(240) 694-landlineRockville11/20/1998
(240) 695-landlineTemple Hills11/20/1998
(240) 696-landlineHyattsvilleLevel 3 Comms07/22/1999
(240) 699-landlineAdamstown05/22/2001
(240) 701-wirelessSilver SpringLeap Wireless Intl DBA Cricket Comm03/25/2009
(240) 704-wirelessMount RainierLeap Wireless Intl DBA Cricket Comm03/25/2009
(240) 705-wirelessChevy ChaseLeap Wireless Intl DBA Cricket Comm03/25/2009
(240) 706-wirelessChevy ChaseLeap Wireless Intl DBA Cricket Comm03/26/2009
(240) 707-wirelessHagerstownCingular Wireless01/27/2012
(240) 708-wirelessColumbiaLevel 3 Comms06/08/2012
(240) 712-wirelessColumbiaVerizon Wireless11/01/2011
(240) 713-landlineLaurelPeerless Network11/02/2011
(240) 715-landlineRockvilleGlobal Crossing Local Services02/27/1999
(240) 716-wirelessMount RainierOmnipoint Comms Cap Operations11/15/2013
(240) 718-landlineCallawayXo Maryland02/13/2001
(240) 720-landlineGaithersburgGlobal Crossing Local Services02/27/1999
(240) 722-landlineSandy SpringGlobal Crossing Local Services02/27/1999
(240) 723-landlineSilver SpringVerizon Wireless05/10/1999
(240) 724-landlineMount RainierCavalier East10/31/2000
(240) 725-landlineLexington Park11/20/1998
(240) 727-wirelessCumberlandCingular Wireless07/22/1999
(240) 731-wirelessRockvilleCingular Wireless10/31/2000
(240) 734-landlineHagerstownBandwidth.com03/22/2012
(240) 737-landlineMount RainierCavalier East05/09/2001
(240) 743-landlineOxon HillLocal Access11/16/2006
(240) 744-landlineMount RainierBroadwing Comms.05/10/1999
(240) 745-landlineDamascusXo Maryland10/31/2001
(240) 747-landlineMount RainierCavalier East05/09/2001
(240) 750-wirelessGaithersburgCingular Wireless05/06/2005
(240) 751-landlineGaithersburgTelcove Operations08/20/2000
(240) 752-landlineBethesdaTelcove Operations08/20/2000
(240) 753-landlineRockvilleTelcove Operations08/20/2000
(240) 754-landlineWaldorfLevel 3 Comms11/11/2011
(240) 755-landlineLaurelComcast Phone Of Northern Maryland01/05/2006
(240) 757-landlineMount RainierPeerless Network07/22/1999
(240) 762-wirelessMount RainierVerizon Wireless08/22/2012
(240) 764-landlineChevy ChaseXo Maryland10/31/2000
(240) 765-landlineChevy ChaseXo Maryland10/31/2000
(240) 766-landlineChevy ChaseXo Maryland10/31/2000
(240) 767-landlineCapitol HeightsCavalier East05/09/2001
(240) 770-landlineOxon HillComcast Phone Of Northern Maryland11/22/2004
(240) 772-wirelessFrederickVerizon Wireless11/17/2011
(240) 773-landlineRockville10/13/1999
(240) 776-landlineLa PlataBroadwing Comms.05/10/1999
(240) 777-landlineRockville05/10/1999
(240) 778-landlineChevy ChaseXo Maryland10/31/2000
(240) 779-landlineSandy SpringCavalier East10/31/2000
(240) 780-landlineGaithersburgBroadwing Comms.05/10/1999
(240) 782-landlineDamascusGlobal Crossing Local Services05/10/1999
(240) 783-wirelessBethesdaMte DBA Mte Paging Network05/10/1999
(240) 784-wirelessMyersvilleOmnipoint Comms Cap Operations06/06/2001
(240) 786-landlineLaurelBroadwing Comms.05/10/1999
(240) 787-landlineBrandywineBroadwing Comms.05/10/1999
(240) 788-landlineOxon HillBroadwing Comms.05/10/1999
(240) 790-landlineMount RainierBroadwing Comms.05/10/1999
(240) 793-wirelessGaithersburgSprint03/15/2001
(240) 794-landlineCallawayBroadwing Comms.05/10/1999
(240) 800-landlineChevy ChaseCore Comms06/22/2012
(240) 801-wirelessGaithersburgVerizon Wireless10/04/2013
(240) 802-wirelessBethesda365 Wireless05/10/2013
(240) 803-wirelessCumberlandCingular Wireless01/27/2012
(240) 804-landlineNewburgXo Maryland04/23/2001
(240) 812-landlinePoolesvilleGlobal Crossing Local Services05/10/1999
(240) 813-landlineGaithersburgAtx Telecom Services, Ltd06/30/2001
(240) 818-landlineSmithsburg10/13/1999
(240) 821-landlineSilver SpringLightwave Comms05/27/2005
(240) 823-landlineBrandywineXo Maryland02/13/2001
(240) 826-landlineRockville05/07/2007
(240) 832-wirelessBethesdaSprint05/10/1999
(240) 833-landlineChevy ChaseXo Maryland10/31/2000
(240) 837-landlineHughesvilleXo Maryland02/13/2001
(240) 838-wirelessOxon HillOmnipoint Comms Cap Operations03/12/2001
(240) 839-wirelessSilver SpringVerizon Wireless01/13/2007
(240) 841-landlineLaurelAllegiance Telecom10/31/2000
(240) 842-landlineGlenn DaleAllegiance Telecom10/31/2000
(240) 843-landlineCollege ParkAllegiance Telecom10/31/2000
(240) 844-landlineRidgeXo Maryland02/13/2001
(240) 845-landlineChevy ChaseXo Maryland10/31/2000
(240) 846-landlineClintonXo Maryland10/31/2000
(240) 848-wirelessGaithersburgSprint03/03/2001
(240) 855-wirelessCabin JohnSprint10/09/2006
(240) 857-landlineMount RainierTw Telecom05/10/1999
(240) 863-landlineLaurelTw Telecom05/10/1999
(240) 864-landlineRockvilleCavalier East05/09/2001
(240) 865-landlineBaltimoreLevel 3 Comms03/03/2001
(240) 868-landlineMount RainierCavalier East05/09/2001
(240) 876-wirelessBethesdaSprint11/20/1998
(240) 880-landlineChevy ChaseBroadwing Comms.07/22/1999
(240) 882-wirelessCapitol HeightsSprint11/20/1998
(240) 883-landlineSandy SpringBroadwing Comms.07/22/1999
(240) 888-wirelessRockvilleCingular Wireless03/03/2001
(240) 892-landlineUpper MarlboroBroadwing Comms.07/22/1999
(240) 893-wirelessSilver SpringCingular Wireless03/03/2001
(240) 895-landlineLexington Park06/30/2001
(240) 897-landlineMount RainierBroadwing Comms.07/22/1999
(240) 898-landlineMount RainierBroadwing Comms.07/22/1999
(240) 899-wirelessBethesdaOmnipoint Comms Cap Operations03/13/2001
(240) 901-wirelessCenturylink Comms05/22/2014
(240) 903-landlineIndian HeadComcast Phone Of Northern Maryland12/03/2013
(240) 912-landlineGaithersburgUs Lec01/14/2000
(240) 920-landlineCumberlandLevel 3 Comms05/03/2001
(240) 925-wirelessLeonardtownVerizon Wireless08/09/2001
(240) 929-landlineMount RainierCavalier East10/13/1999
(240) 938-wirelessAshtonOmnipoint Comms Cap Operations06/06/2001
(240) 949-landlineMount RainierCavalier East05/09/2001
(240) 964-landlineCumberland05/27/2008
(240) 965-landlineCollege ParkPaetec Comms10/31/2000
(240) 976-wirelessBaltimore-washington Telephone (bwt)10/17/2005
(240) 979-landlineCumberlandLevel 3 Comms03/03/2001
(240) 986-landlineNanjemoyXo Maryland02/13/2001
(240) 988-wirelessBeltsvilleSprint05/10/1999
(240) 993-landlineIndian HeadXo Maryland02/13/2001
(240) 994-wirelessRockvilleVerizon Wireless10/13/1999
(240) 997-wirelessSilver SpringVerizon Wireless10/13/1999