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NDC: 240

This is the National Destination Code(NDC):240 page list. Its detail is as below.
Area code 240 was first put in service June 1, 1997. Currently, the largest city it serves is Germantown, MD, and it overlaps coverage areas with area codes 227 and 301.
Prefix State Primary city Usage Carrier
(240) 312- Maryland Capitol Heights Landline Cavalier Telephone Mid-atlantic
(240) 313- Maryland Hagerstown Landline Verizon Maryland
(240) 314- Maryland Rockville Landline Verizon Maryland
(240) 315- Maryland Frederick Landline Verizon Maryland
(240) 316- Maryland Chevy Chase Wireless Sprint Spectrum L.p.
(240) 317- Maryland Callaway Landline Starpower Communications
(240) 318- Maryland Clinton Landline Verizon Maryland
(240) 319- Maryland Columbia Wireless Cellco Partnership DBA Verizon Wireless
(240) 320- Maryland Waldorf Landline Cavalier East LLC
(240) 321- Maryland Oakland Wireless Uscoc Of Cumberland DBA United States Cel Md
(240) 322- Maryland Mccoole Landline Core Communications
(240) 323- Maryland Emmitsburg Landline Core Communications
(240) 324- Maryland Clarksville Landline Ymax Communications Corp.
(240) 325- Maryland Damascus Landline Core Communications
(240) 326- Maryland Upper Marlboro Landline Cavalier Telephone Mid-atlantic
(240) 327- Maryland Gaithersburg Landline Core Communications
(240) 328- Maryland Rockville Landline Verizon Maryland
(240) 329- Maryland Hagerstown Landline Level 3 Communications
(240) 330- Maryland Cabin John Wireless Sprint Spectrum L.p.
(240) 331- Maryland Mount Rainier Landline Peerless Network Of Maryland
(240) 332- Maryland Newburg Landline Peerless Network Of Maryland
(240) 333- Maryland Mount Rainier Landline Cavalier East LLC
(240) 334- Maryland Mount Rainier Landline Global Crossing Local Services-md
(240) 335- Maryland Glenn Dale Landline Cavalier Telephone Mid-atlantic
(240) 336- Maryland Bethesda Landline Core Communications
(240) 337- Maryland Mount Rainier Landline Peerless Network Of Maryland
(240) 338- Maryland Silver Spring Wireless Cellco Partnership DBA Verizon Wireless
(240) 339- Maryland Upper Marlboro Landline Cavalier East LLC
(240) 340- Maryland Bethesda Wireless Sprint Spectrum L.p.
(240) 341- Maryland Adamstown Landline Mci Worldcom Communications
(240) 342- Maryland Sandy Spring Landline Starpower Communications
(240) 343- Maryland Hancock Wireless Cellco Partnership DBA Verizon Wireless
(240) 344- Maryland Frederick Wireless New Cingular Wireless PCS - DC
(240) 345- Maryland Sandy Spring Landline Level 3 Communications
(240) 346- Maryland Waldorf Wireless Sprint Spectrum L.p.
(240) 347- Maryland Hagerstown Landline Bandwidth.com Clec
(240) 348- Maryland Oxon Hill Landline Level 3 Communications
(240) 349- Maryland La Plata Landline Global Crossing Local Services-md
(240) 350- Maryland Beltsville Wireless Sprint Spectrum L.p.
(240) 351- Maryland Beltsville Wireless Sprint Spectrum L.p.
(240) 352- Maryland La Plata Landline Peerless Network Of Maryland
(240) 353- Maryland Beltsville Wireless Sprint Spectrum L.p.
(240) 354- Maryland Beltsville Wireless Sprint Spectrum L.p.
(240) 355- Maryland Beltsville Wireless Sprint Spectrum L.p.
(240) 356- Maryland Frederick Landline Level 3 Communications
(240) 357- Maryland Frederick Wireless Cellco Partnership DBA Verizon Wireless
(240) 358- Maryland Damascus Landline Peerless Network Of Maryland
(240) 359- Maryland Indian Head Landline Peerless Network Of Maryland
(240) 360- Maryland Laurel Wireless Omnipoint Communications Cap Operations
(240) 361- Maryland Gaithersburg Landline Cavalier Telephone Mid-atlantic
(240) 362- Maryland Cumberland Landline Verizon Maryland
(240) 363- Maryland Kensington Landline Global Naps South
(240) 364- Maryland Gaithersburg Landline Cavalier East LLC
(240) 365- Maryland Damascus Landline Baltimore-washington Telephone (bwt)
(240) 366- Maryland Williamsport Landline AT&T Local
(240) 367- Maryland Frederick Wireless Sprint Spectrum L.p.
(240) 368- Maryland Waldorf Landline Peerless Network Of Maryland
(240) 369- Maryland Mount Airy Landline Core Communications
(240) 370- Maryland Bethesda Wireless Sprint Spectrum L.p.
(240) 371- Maryland Mount Rainier Landline Peerless Network Of Maryland
(240) 372- Maryland Gaithersburg Wireless Sprint Spectrum L.p.
(240) 373- Maryland Odenton Landline Verizon Maryland
(240) 374- Maryland Laurel Landline Global Crossing Local Services-md
(240) 375- Maryland Capitol Heights Wireless Sprint Spectrum L.p.
(240) 376- Maryland Hughesville Landline Peerless Network Of Maryland
(240) 377- Maryland Indian Head Landline Global Crossing Local Services-md
(240) 378- Maryland Cumberland Landline Core Communications
(240) 379- Maryland Frederick Landline Verizon Maryland
(240) 380- Maryland Cabin John Wireless Cellco Partnership DBA Verizon Wireless
(240) 381- Maryland Silver Spring Wireless New Cingular Wireless PCS - DC
(240) 382- Maryland Hagerstown Landline Teleport Communications America
(240) 383- Maryland Chevy Chase Wireless New Cingular Wireless PCS - DC
(240) 384- Maryland Callaway Landline Peerless Network Of Maryland
(240) 385- Maryland Myersville Landline Verizon Maryland
(240) 386- Maryland Gaithersburg Landline Verizon Maryland
(240) 387- Maryland Chevy Chase Landline Cavalier East LLC
(240) 388- Maryland Gaithersburg Wireless Sprint Spectrum L.p.
(240) 389- Maryland Sandy Spring Landline Atx Telecommunications Services, Ltd
(240) 390- Maryland Sandy Spring Landline Cavalier Telephone Mid-atlantic
(240) 391- Maryland Mount Rainier Landline Global Crossing Local Services-md
(240) 392- Maryland Oxon Hill Landline Starpower Communications
(240) 393- Maryland Cabin John Wireless Cellco Partnership DBA Verizon Wireless
(240) 394- Maryland Mount Airy Wireless New Cingular Wireless PCS - DC
(240) 395- Maryland Bethesda Landline Cavalier Telephone Mid-atlantic
(240) 396- Maryland Mount Rainier Landline Global Crossing Local Services-md
(240) 397- Maryland Frederick Wireless Cellco Partnership DBA Verizon Wireless
(240) 398- Maryland Cabin John Wireless Sprint Spectrum L.p.
(240) 399- Maryland Chevy Chase Landline Xo Maryland
(240) 400- Maryland Bethesda Wireless Sprint Spectrum L.p.
(240) 401- Maryland Rockville Wireless New Cingular Wireless PCS - DC
(240) 402- Maryland College Park Landline Mci Worldcom Communications
(240) 403- Maryland Rockville Landline Cavalier Telephone Mid-atlantic
(240) 404- Maryland Gaithersburg Landline Xo Maryland
(240) 405- Maryland Frederick Landline Us Lec Of Maryland
(240) 406- Maryland Rockville Wireless Leap Wireless Intl DBA Cricket Comm
(240) 407- Maryland Mount Rainier Landline Global Crossing Local Services-md
(240) 408- Maryland Rockville Wireless Leap Wireless Intl DBA Cricket Comm
(240) 409- Maryland Frederick Wireless New Cingular Wireless PCS - DC
(240) 412- Maryland Waldorf Wireless Sprint Spectrum L.p.
(240) 413- Maryland Hyattsville Wireless Omnipoint Communications Cap Operations