001240
說明：240是美國內部城市馬里蘭州之間的長途區號，從美國以外撥打馬里蘭州電話需要加上美國的國際區號1，也就是美國馬里蘭州的國際城市區號為001240或者寫為001-240、0010240、+1-240、+1+240、+1240、00-1-240、00 1 240。
以240開頭的號碼前綴列表
| 號碼前綴 | 固話/手機 | 主要城市 | 運營商 |
| (240) 200- | 固話 | Mount Rainier | Bandwidth.com Clec |
| (240) 201- | 固話 | Ridge | Peerless Network Of The District Of Columbia, Dc |
| (240) 203- | 手機 | Hagerstown | Sprint Spectrum L.p. |
| (240) 204- | 手機 | Bethesda | Cellco Partnership DBA Verizon Wireless |
| (240) 205- | 手機 | Cabin John | New Cingular Wireless PCS - DC |
| (240) 206- | 固話 | Glenn Dale | Xo Maryland |
| (240) 207- | 固話 | Damascus | Cavalier East LLC |
| (240) 208- | 固話 | La Plata | Peerless Network Of The District Of Columbia, Dc |
| (240) 209- | 固話 | Indian Head | Peerless Network Of The District Of Columbia, Dc |
| (240) 210- | 手機 | Waldorf | New Cingular Wireless PCS - DC |
| (240) 212- | 固話 | Oakland | Core Communications |
| (240) 213- | 固話 | Waldorf | Peerless Network Of The District Of Columbia, Dc |
| (240) 214- | 固話 | Mechanicsville | Peerless Network Of The District Of Columbia, Dc |
| (240) 215- | 固話 | Frederick | Telcove Operations |
| (240) 216- | 手機 | Waldorf | Sprint Spectrum L.p. |
| (240) 217- | 手機 | Hagerstown | Omnipoint Communications Cap Operations |
| (240) 218- | 固話 | Nanjemoy | Peerless Network Of The District Of Columbia, Dc |
| (240) 220- | 固話 | Poolesville | Peerless Network Of Maryland |
| (240) 221- | 固話 | Rockville | Verizon Maryland |
| (240) 222- | 固話 | Waldorf | Cavalier Telephone Mid-atlantic |
| (240) 223- | 固話 | Mount Rainier | Allegiance Telecom |
| (240) 224- | 手機 | Gaithersburg | Cellco Partnership DBA Verizon Wireless |
| (240) 225- | 固話 | Frederick | Core Communications |
| (240) 228- | 固話 | Laurel | Verizon Maryland |
| (240) 229- | 固話 | Waldorf | Broadwing Communications. LLC |
| (240) 230- | 固話 | Hughesville | Global Crossing Local Services-md |
| (240) 231- | 固話 | Hagerstown | Core Communications |
| (240) 232- | 固話 | Mount Rainier | Broadwing Communications. LLC |
| (240) 233- | 固話 | Newburg | Teleport Communications America - DC |
| (240) 234- | 手機 | Mount Rainier | Cellco Partnership DBA Verizon Wireless |
| (240) 235- | 固話 | Bethesda | Paetec Communications |
| (240) 236- | 固話 | Frederick | Verizon Maryland |
| (240) 237- | 固話 | Callaway | Teleport Communications America - DC |
| (240) 238- | 固話 | Rockville | Paetec Communications |
| (240) 239- | 固話 | Leonardtown | Core Communications |
| (240) 241- | 固話 | Chevy Chase | Starpower Communications |
| (240) 242- | 固話 | Kensington | Starpower Communications |
| (240) 243- | 固話 | Gaithersburg | Allegiance Telecom |
| (240) 244- | 固話 | Mount Rainier | Starpower Communications |
| (240) 245- | 固話 | Glenn Dale | Starpower Communications |
| (240) 246- | 固話 | Gaithersburg | Starpower Communications |
| (240) 247- | 固話 | Mount Rainier | Allegiance Telecom |
| (240) 248- | 固話 | Ridge | Peerless Network Of Maryland |
| (240) 249- | 固話 | Mechanicsville | Teleport Communications America - DC |
| (240) 250- | 固話 | Brandywine | Peerless Network Of Maryland |
| (240) 251- | 固話 | Highfield | Core Communications |
| (240) 252- | 固話 | Gaithersburg | Level 3 Communications |
| (240) 253- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 254- | 固話 | Hughesville | Teleport Communications America - DC |
| (240) 255- | 固話 | Poolesville | Peerless Network Of Maryland |
| (240) 256- | 固話 | Leonardtown | Teleport Communications America - DC |
| (240) 257- | 固話 | Nanjemoy | Teleport Communications America - DC |
| (240) 258- | 固話 | Ridge | Teleport Communications America - DC |
| (240) 260- | 固話 | Mount Rainier | Allegiance Telecom |
| (240) 262- | 手機 | Callaway | Sprint Spectrum L.p. |
| (240) 263- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 264- | 固話 | Beltsville | Verizon Maryland |
| (240) 265- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 266- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 268- | 固話 | Rockville | Allegiance Telecom |
| (240) 269- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 270- | 手機 | Waldorf | Cellco Partnership DBA Verizon Wireless |
| (240) 271- | 手機 | Bethesda | New Cingular Wireless PCS - DC |
| (240) 272- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 273- | 固話 | Mount Rainier | Broadwing Communications. LLC |
| (240) 274- | 手機 | Bethesda | New Cingular Wireless PCS - DC |
| (240) 275- | 固話 | Grantsville | Core Communications |
| (240) 276- | 固話 | Rockville | Verizon Maryland |
| (240) 277- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 278- | 手機 | Laurel | Cellco Partnership DBA Verizon Wireless |
| (240) 279- | 固話 | Waldorf | Core Communications |
| (240) 280- | 固話 | Laurel | Comcast Phone Of Northern Maryland |
| (240) 281- | 手機 | Bethesda | New Cingular Wireless PCS - DC |
| (240) 282- | 固話 | Mechanicsville | Peerless Network Of Maryland |
| (240) 283- | 固話 | Kensington | Paetec Communications |
| (240) 284- | 固話 | Frostburg | Level 3 Communications |
| (240) 285- | 固話 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 286- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 287- | 固話 | Hancock | Core Communications |
| (240) 288- | 固話 | Thurmont | Comcast Phone Of Northern Maryland |
| (240) 289- | 固話 | Oxon Hill | Cavalier Telephone Mid-atlantic |
| (240) 290- | 固話 | Mount Rainier | Allegiance Telecom |
| (240) 291- | 手機 | Hagerstown | New Cingular Wireless PCS - DC |
| (240) 292- | 固話 | Kensington | Verizon Maryland |
| (240) 293- | 固話 | Mount Rainier | Starpower Communications |
| (240) 294- | 固話 | Laurel | Xo Maryland |
| (240) 295- | 固話 | Laurel | Cavalier Telephone Mid-atlantic |
| (240) 296- | 固話 | Hyattsville | Cavalier Telephone Mid-atlantic |
| (240) 297- | 固話 | College Park | Level 3 Communications |
| (240) 298- | 手機 | Leonardtown | Cellco Partnership DBA Verizon Wireless |
| (240) 299- | 手機 | Waldorf | Sprint Spectrum L.p. |
| (240) 300- | 手機 | Waldorf | Cellco Partnership DBA Verizon Wireless |
| (240) 303- | 固話 | Clinton | Cavalier Telephone Mid-atlantic |
| (240) 304- | 手機 | Mount Rainier | Sprint Spectrum L.p. |
| (240) 305- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 306- | 固話 | Gaithersburg | Allegiance Telecom |
| (240) 307- | 固話 | Emmitsburg | AT&T Local |
| (240) 308- | 手機 | Damascus | New Cingular Wireless PCS - DC |
| (240) 309- | 手機 | Leonardtown | Cellco Partnership DBA Verizon Wireless |
| (240) 310- | 手機 | Hagerstown | Uscoc Of Cumberland DBA United States Cel Md |
| (240) 312- | 固話 | Capitol Heights | Cavalier Telephone Mid-atlantic |
| (240) 313- | 固話 | Hagerstown | Verizon Maryland |
| (240) 314- | 固話 | Rockville | Verizon Maryland |
| (240) 315- | 固話 | Frederick | Verizon Maryland |
| (240) 316- | 手機 | Chevy Chase | Sprint Spectrum L.p. |
| (240) 317- | 固話 | Callaway | Starpower Communications |
| (240) 318- | 固話 | Clinton | Verizon Maryland |
| (240) 319- | 手機 | Columbia | Cellco Partnership DBA Verizon Wireless |
| (240) 320- | 固話 | Waldorf | Cavalier East LLC |
| (240) 321- | 手機 | Oakland | Uscoc Of Cumberland DBA United States Cel Md |
| (240) 322- | 固話 | Mccoole | Core Communications |
| (240) 323- | 固話 | Emmitsburg | Core Communications |
| (240) 324- | 固話 | Clarksville | Ymax Communications Corp. |
| (240) 325- | 固話 | Damascus | Core Communications |
| (240) 326- | 固話 | Upper Marlboro | Cavalier Telephone Mid-atlantic |
| (240) 327- | 固話 | Gaithersburg | Core Communications |
| (240) 328- | 固話 | Rockville | Verizon Maryland |
| (240) 329- | 固話 | Hagerstown | Level 3 Communications |
| (240) 330- | 手機 | Cabin John | Sprint Spectrum L.p. |
| (240) 331- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 332- | 固話 | Newburg | Peerless Network Of Maryland |
| (240) 333- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 334- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 335- | 固話 | Glenn Dale | Cavalier Telephone Mid-atlantic |
| (240) 336- | 固話 | Bethesda | Core Communications |
| (240) 337- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 338- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 339- | 固話 | Upper Marlboro | Cavalier East LLC |
| (240) 340- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 341- | 固話 | Adamstown | Mci Worldcom Communications |
| (240) 342- | 固話 | Sandy Spring | Starpower Communications |
| (240) 343- | 手機 | Hancock | Cellco Partnership DBA Verizon Wireless |
| (240) 344- | 手機 | Frederick | New Cingular Wireless PCS - DC |
| (240) 345- | 固話 | Sandy Spring | Level 3 Communications |
| (240) 346- | 手機 | Waldorf | Sprint Spectrum L.p. |
| (240) 347- | 固話 | Hagerstown | Bandwidth.com Clec |
| (240) 348- | 固話 | Oxon Hill | Level 3 Communications |
| (240) 349- | 固話 | La Plata | Global Crossing Local Services-md |
| (240) 350- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 351- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 352- | 固話 | La Plata | Peerless Network Of Maryland |
| (240) 353- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 354- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 355- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 356- | 固話 | Frederick | Level 3 Communications |
| (240) 357- | 手機 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 358- | 固話 | Damascus | Peerless Network Of Maryland |
| (240) 359- | 固話 | Indian Head | Peerless Network Of Maryland |
| (240) 360- | 手機 | Laurel | Omnipoint Communications Cap Operations |
| (240) 361- | 固話 | Gaithersburg | Cavalier Telephone Mid-atlantic |
| (240) 362- | 固話 | Cumberland | Verizon Maryland |
| (240) 363- | 固話 | Kensington | Global Naps South |
| (240) 364- | 固話 | Gaithersburg | Cavalier East LLC |
| (240) 365- | 固話 | Damascus | Baltimore-washington Telephone (bwt) |
| (240) 366- | 固話 | Williamsport | AT&T Local |
| (240) 367- | 手機 | Frederick | Sprint Spectrum L.p. |
| (240) 368- | 固話 | Waldorf | Peerless Network Of Maryland |
| (240) 369- | 固話 | Mount Airy | Core Communications |
| (240) 370- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 371- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 372- | 手機 | Gaithersburg | Sprint Spectrum L.p. |
| (240) 373- | 固話 | Odenton | Verizon Maryland |
| (240) 374- | 固話 | Laurel | Global Crossing Local Services-md |
| (240) 375- | 手機 | Capitol Heights | Sprint Spectrum L.p. |
| (240) 376- | 固話 | Hughesville | Peerless Network Of Maryland |
| (240) 377- | 固話 | Indian Head | Global Crossing Local Services-md |
| (240) 378- | 固話 | Cumberland | Core Communications |
| (240) 379- | 固話 | Frederick | Verizon Maryland |
| (240) 380- | 手機 | Cabin John | Cellco Partnership DBA Verizon Wireless |
| (240) 381- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 382- | 固話 | Hagerstown | Teleport Communications America |
| (240) 383- | 手機 | Chevy Chase | New Cingular Wireless PCS - DC |
| (240) 384- | 固話 | Callaway | Peerless Network Of Maryland |
| (240) 385- | 固話 | Myersville | Verizon Maryland |
| (240) 386- | 固話 | Gaithersburg | Verizon Maryland |
| (240) 387- | 固話 | Chevy Chase | Cavalier East LLC |
| (240) 388- | 手機 | Gaithersburg | Sprint Spectrum L.p. |
| (240) 389- | 固話 | Sandy Spring | Atx Telecommunications Services, Ltd |
| (240) 390- | 固話 | Sandy Spring | Cavalier Telephone Mid-atlantic |
| (240) 391- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 392- | 固話 | Oxon Hill | Starpower Communications |
| (240) 393- | 手機 | Cabin John | Cellco Partnership DBA Verizon Wireless |
| (240) 394- | 手機 | Mount Airy | New Cingular Wireless PCS - DC |
| (240) 395- | 固話 | Bethesda | Cavalier Telephone Mid-atlantic |
| (240) 396- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 397- | 手機 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 398- | 手機 | Cabin John | Sprint Spectrum L.p. |
| (240) 399- | 固話 | Chevy Chase | Xo Maryland |
| (240) 400- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 401- | 手機 | Rockville | New Cingular Wireless PCS - DC |
| (240) 402- | 固話 | College Park | Mci Worldcom Communications |
| (240) 403- | 固話 | Rockville | Cavalier Telephone Mid-atlantic |
| (240) 404- | 固話 | Gaithersburg | Xo Maryland |
| (240) 405- | 固話 | Frederick | Us Lec Of Maryland |
| (240) 406- | 手機 | Rockville | Leap Wireless Intl DBA Cricket Comm |
| (240) 407- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 408- | 手機 | Rockville | Leap Wireless Intl DBA Cricket Comm |
| (240) 409- | 手機 | Frederick | New Cingular Wireless PCS - DC |
| (240) 412- | 手機 | Waldorf | Sprint Spectrum L.p. |
| (240) 413- | 手機 | Hyattsville | Omnipoint Communications Cap Operations |
| (240) 414- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 415- | 固話 | Frederick | Ymax Communications Corp. |
| (240) 416- | 手機 | Waldorf | New Cingular Wireless PCS - DC |
| (240) 417- | 手機 | Capitol Heights | Sprint Spectrum L.p. |
| (240) 418- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 419- | 手機 | Waldorf | Cellco Partnership DBA Verizon Wireless |
| (240) 420- | 固話 | Hagerstown | Verizon Maryland |
| (240) 421- | 手機 | Rockville | Omnipoint Communications Cap Operations |
| (240) 422- | 手機 | Frederick | Omnipoint Communications Cap Operations |
| (240) 423- | 手機 | Silver Spring | Omnipoint Communications Cap Operations |
| (240) 424- | 手機 | Mount Rainier | Sprint Spectrum L.p. |
| (240) 425- | 固話 | Cabin John | Dslnet Communications Va |
| (240) 426- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 427- | 固話 | Waldorf | Xo Maryland |
| (240) 428- | 固話 | Rockville | Bandwidth.com Clec |
| (240) 429- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 430- | 固話 | Kensington | Cavalier Telephone Mid-atlantic |
| (240) 431- | 手機 | Tall Timbers | Sprint Spectrum L.p. |
| (240) 432- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 433- | 固話 | Silver Spring | Cavalier Telephone Mid-atlantic |
| (240) 434- | 固話 | Leonardtown | Broadwing Communications. LLC |
| (240) 435- | 手機 | Waldorf | Cellco Partnership DBA Verizon Wireless |
| (240) 436- | 固話 | Ijamsville | Telcove Operations |
| (240) 437- | 固話 | Sandy Spring | Xo Maryland |
| (240) 438- | 手機 | Silver Spring | Sprint Spectrum L.p. |
| (240) 439- | 手機 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 440- | 手機 | Frederick | Leap Wireless Intl DBA Cricket Comm |
| (240) 441- | 手機 | Oxon Hill | Omnipoint Communications Cap Operations |
| (240) 442- | 固話 | Oakland | Verizon Maryland |
| (240) 444- | 手機 | Laurel | Cellco Partnership DBA Verizon Wireless |
| (240) 445- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 446- | 手機 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 447- | 手機 | Rockville | New Cingular Wireless PCS - DC |
| (240) 448- | 手機 | Waldorf | Sprint Spectrum L.p. |
| (240) 449- | 手機 | Gaithersburg | New Cingular Wireless PCS - DC |
| (240) 450- | 固話 | Silver Spring | Cavalier Telephone Mid-atlantic |
| (240) 452- | 固話 | Hagerstown | Lumos Networks Inc. - VA |
| (240) 453- | 固話 | Rockville | Verizon Maryland |
| (240) 454- | 手機 | Gaithersburg | Paetec Communications |
| (240) 455- | 固話 | Oxon Hill | Paetec Communications |
| (240) 456- | 固話 | Laurel | Verizon Maryland |
| (240) 457- | 手機 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 458- | 手機 | Waldorf | Cellco Partnership DBA Verizon Wireless |
| (240) 459- | 手機 | Laurel | Cellco Partnership DBA Verizon Wireless |
| (240) 460- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 461- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 462- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 463- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 464- | 固話 | Chevy Chase | Sprint Spectrum L.p. |
| (240) 465- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 466- | 手機 | Mechanicsville | New Cingular Wireless PCS - DC |
| (240) 467- | 固話 | Oxon Hill | Comcast Phone Of Northern Maryland |
| (240) 468- | 手機 | Mount Rainier | Sprint Spectrum L.p. |
| (240) 469- | 手機 | Hagerstown | Sprint Spectrum L.p. |
| (240) 470- | 手機 | Laurel | Cellco Partnership DBA Verizon Wireless |
| (240) 471- | 固話 | Silver Spring | Global Crossing Local Services-md |
| (240) 472- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 473- | 固話 | College Park | Cavalier Telephone Mid-atlantic |
| (240) 475- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 476- | 手機 | Silver Spring | Omnipoint Communications Cap Operations |
| (240) 477- | 固話 | Gaithersburg | Lightwave Communications |
| (240) 478- | 手機 | Cabin John | New Cingular Wireless PCS - DC |
| (240) 479- | 手機 | Oxon Hill | Cellco Partnership DBA Verizon Wireless |
| (240) 480- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 481- | 手機 | Silver Spring | Omnipoint Communications Cap Operations |
| (240) 482- | 固話 | Cabin John | Us Lec Of Maryland |
| (240) 483- | 固話 | Oxon Hill | Comcast Phone Of Northern Maryland |
| (240) 485- | 固話 | Cabin John | Us Lec Of Maryland |
| (240) 486- | 手機 | Glenn Dale | Omnipoint Communications Cap Operations |
| (240) 487- | 固話 | Hyattsville | Us Lec Of Maryland |
| (240) 488- | 固話 | Oakland | Shentel Communications |
| (240) 489- | 固話 | Poolesville | Xo Maryland |
| (240) 490- | 手機 | Middletown | Omnipoint Communications Cap Operations |
| (240) 491- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 492- | 固話 | Capitol Heights | Us Lec Of Maryland |
| (240) 493- | 固話 | Oxon Hill | Us Lec Of Maryland |
| (240) 494- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 495- | 手機 | Mount Rainier | Cellco Partnership DBA Verizon Wireless |
| (240) 497- | 固話 | Chevy Chase | Verizon Maryland |
| (240) 498- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 499- | 固話 | Cabin John | Us Lec Of Maryland |
| (240) 500- | 固話 | Hagerstown | Us Lec Of Maryland |
| (240) 501- | 手機 | Silver Spring | Sprint Spectrum L.p. |
| (240) 502- | 手機 | Silver Spring | Sprint Spectrum L.p. |
| (240) 503- | 固話 | Newburg | Peerless Network Of Maryland |
| (240) 504- | 手機 | Silver Spring | Sprint Spectrum L.p. |
| (240) 505- | 手機 | Silver Spring | Omnipoint Communications Cap Operations |
| (240) 506- | 手機 | Rockville | New Cingular Wireless PCS - DC |
| (240) 507- | 手機 | Cabin John | Cellco Partnership DBA Verizon Wireless |
| (240) 508- | 手機 | Capitol Heights | Sprint Spectrum L.p. |
| (240) 509- | 固話 | Crofton | Bandwidth.com Clec |
| (240) 510- | 固話 | Upper Marlboro | Xo Maryland |
| (240) 512- | 固話 | College Park | Core Communications |
| (240) 513- | 手機 | Hagerstown | Sprint Spectrum L.p. |
| (240) 514- | 固話 | Cabin John | Us Lec Of Maryland |
| (240) 515- | 手機 | Bethesda | New Cingular Wireless PCS - DC |
| (240) 516- | 固話 | Silver Spring | Us Lec Of Maryland |
| (240) 518- | 手機 | Waldorf | Sprint Spectrum L.p. |
| (240) 519- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 520- | 手機 | Hagerstown | Sprint Spectrum L.p. |
| (240) 522- | 手機 | Cumberland | Sprint Spectrum L.p. |
| (240) 523- | 固話 | La Plata | Xo Maryland |
| (240) 524- | 固話 | Laurel | Peerless Network Of Maryland |
| (240) 525- | 固話 | Upper Marlboro | Peerless Network Of Maryland |
| (240) 526- | 固話 | Leonardtown | Peerless Network Of Maryland |
| (240) 527- | 固話 | Hagerstown | Verizon Maryland |
| (240) 528- | 固話 | Hughesville | Broadwing Communications. LLC |
| (240) 529- | 固話 | Frederick | Verizon Maryland |
| (240) 530- | 固話 | Waldorf | Local Access LLC |
| (240) 532- | 手機 | Oxon Hill | Cellco Partnership DBA Verizon Wireless |
| (240) 533- | 固話 | Mount Rainier | Teleport Communications America - DC |
| (240) 535- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 536- | 固話 | Sandy Spring | Peerless Network Of Maryland |
| (240) 538- | 固話 | Leonardtown | Xo Maryland |
| (240) 539- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 541- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 542- | 固話 | College Park | Us Lec Of Maryland |
| (240) 543- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 544- | 固話 | Glenn Dale | Us Lec Of Maryland |
| (240) 545- | 固話 | Upper Marlboro | Us Lec Of Maryland |
| (240) 546- | 固話 | Clinton | Us Lec Of Maryland |
| (240) 547- | 固話 | Laurel | Level 3 Communications |
| (240) 548- | 固話 | Mount Rainier | Allegiance Telecom |
| (240) 550- | 手機 | Rockville | Leap Wireless Intl DBA Cricket Comm |
| (240) 551- | 手機 | Rockville | Leap Wireless Intl DBA Cricket Comm |
| (240) 552- | 手機 | Rockville | Leap Wireless Intl DBA Cricket Comm |
| (240) 553- | 固話 | Mount Rainier | Allegiance Telecom |
| (240) 554- | 固話 | Laurel | Allegiance Telecom |
| (240) 556- | 固話 | Glenn Dale | Paetec Communications |
| (240) 558- | 固話 | Kensington | Cavalier Telephone Mid-atlantic |
| (240) 559- | 固話 | Sandy Spring | Allegiance Telecom |
| (240) 560- | 固話 | Chevy Chase | Xo Maryland |
| (240) 561- | 手機 | Leonardtown | Cellco Partnership DBA Verizon Wireless |
| (240) 565- | 手機 | Laurel | Omnipoint Communications Cap Operations |
| (240) 566- | 固話 | Frederick | Verizon Maryland |
| (240) 567- | 固話 | Rockville | Verizon Maryland |
| (240) 568- | 固話 | Laurel | Verizon Maryland |
| (240) 573- | 固話 | Upper Marlboro | Global Crossing Local Services-md |
| (240) 575- | 固話 | Frederick | Level 3 Communications |
| (240) 577- | 手機 | Leonardtown | Cellco Partnership DBA Verizon Wireless |
| (240) 578- | 手機 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 580- | 手機 | Cumberland | Sprint Spectrum L.p. |
| (240) 581- | 固話 | Laurel | Paetec Communications - DC |
| (240) 582- | 固話 | Hyattsville | Verizon Maryland |
| (240) 583- | 固話 | Beltsville | Verizon Maryland |
| (240) 585- | 手機 | Waldorf | Cellco Partnership DBA Verizon Wireless |
| (240) 586- | 固話 | Frederick | Verizon Maryland |
| (240) 587- | 手機 | Leonardtown | Cellco Partnership DBA Verizon Wireless |
| (240) 593- | 手機 | Laurel | Omnipoint Communications Cap Operations |
| (240) 595- | 手機 | Chevy Chase | Cellco Partnership DBA Verizon Wireless |
| (240) 597- | 固話 | Gaithersburg | Peerless Network Of Maryland |
| (240) 599- | 固話 | Rockville | Broadwing Communications. LLC |
| (240) 600- | 手機 | Mount Rainier | Sprint Spectrum L.p. |
| (240) 601- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 602- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 603- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 604- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 605- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 606- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 607- | 固話 | Waldorf | Global Crossing Local Services-md |
| (240) 608- | 手機 | Frederick | 365 Wireless |
| (240) 612- | 固話 | Mount Rainier | Tw Telecom Of Maryland LLC |
| (240) 613- | 固話 | Hyattsville | Us Lec Of Maryland |
| (240) 614- | 手機 | Rockville | Metro PCS |
| (240) 615- | 手機 | Hyattsville | Metro PCS |
| (240) 616- | 固話 | College Park | Mci Worldcom Communications |
| (240) 617- | Unknown | Shentel Communications | |
| (240) 619- | 固話 | Chevy Chase | Mci Worldcom Communications |
| (240) 620- | 固話 | Rockville | Mci Worldcom Communications |
| (240) 621- | 固話 | Kensington | Mci Worldcom Communications |
| (240) 624- | 固話 | Greenbelt | Verizon Maryland |
| (240) 625- | 手機 | Hagerstown | Sprint Spectrum L.p. |
| (240) 626- | 手機 | Frederick | Sprint Spectrum L.p. |
| (240) 627- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 629- | 固話 | Frederick | Verizon Maryland |
| (240) 630- | 固話 | Mount Rainier | Bandwidth.com Clec |
| (240) 631- | 固話 | Gaithersburg | Verizon Maryland |
| (240) 632- | 固話 | Gaithersburg | Verizon Maryland |
| (240) 638- | 固話 | Mount Rainier | Broadwing Communications. LLC |
| (240) 640- | 手機 | Waldorf | Leap Wireless Intl DBA Cricket Comm |
| (240) 643- | 手機 | Silver Spring | Omnipoint Communications Cap Operations |
| (240) 644- | 固話 | Chevy Chase | Xo Maryland |
| (240) 645- | 固話 | Chevy Chase | Xo Maryland |
| (240) 646- | 固話 | Laurel | Cavalier East LLC |
| (240) 650- | 固話 | Cabin John | Broadvox-clec - DC |
| (240) 651- | 手機 | Frederick | Halo Wireless Services |
| (240) 652- | 固話 | Mechanicsville | Xo Maryland |
| (240) 654- | 手機 | Gaithersburg | New Cingular Wireless PCS - DC |
| (240) 662- | 固話 | Silver Spring | Verizon Maryland |
| (240) 667- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 668- | 固話 | Damascus | Starpower Communications |
| (240) 669- | 固話 | Kensington | Comcast Phone Of Northern Maryland |
| (240) 670- | 固話 | Mount Rainier | Local Access LLC |
| (240) 671- | 手機 | Mount Rainier | Sprint Spectrum L.p. |
| (240) 672- | 固話 | Rockville | Cellco Partnership DBA Verizon Wireless |
| (240) 674- | 手機 | Frederick | Sprint Spectrum L.p. |
| (240) 675- | 手機 | Myersville | New Cingular Wireless PCS - DC |
| (240) 676- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 678- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 682- | 固話 | Waldorf | Starpower Communications |
| (240) 683- | 固話 | Gaithersburg | Verizon Maryland |
| (240) 684- | 固話 | Greenbelt | Verizon Maryland |
| (240) 685- | 固話 | Brandywine | Global Crossing Local Services-md |
| (240) 686- | 固話 | Gaithersburg | Verizon Maryland |
| (240) 687- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 688- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 691- | 固話 | Mount Rainier | Global Crossing Local Services-md |
| (240) 694- | 固話 | Rockville | Verizon Maryland |
| (240) 695- | 固話 | Temple Hills | Verizon Maryland |
| (240) 696- | 固話 | Hyattsville | Level 3 Communications |
| (240) 699- | 固話 | Adamstown | Verizon Maryland |
| (240) 701- | 手機 | Silver Spring | Leap Wireless Intl DBA Cricket Comm |
| (240) 704- | 手機 | Mount Rainier | Leap Wireless Intl DBA Cricket Comm |
| (240) 705- | 手機 | Chevy Chase | Leap Wireless Intl DBA Cricket Comm |
| (240) 706- | 手機 | Chevy Chase | Leap Wireless Intl DBA Cricket Comm |
| (240) 707- | 手機 | Hagerstown | New Cingular Wireless PCS - DC |
| (240) 708- | 手機 | Columbia | Level 3 Communications |
| (240) 712- | 手機 | Columbia | Cellco Partnership DBA Verizon Wireless |
| (240) 713- | 固話 | Laurel | Peerless Network Of Maryland |
| (240) 715- | 固話 | Rockville | Global Crossing Local Services-md |
| (240) 716- | 手機 | Mount Rainier | Omnipoint Communications Cap Operations |
| (240) 718- | 固話 | Callaway | Xo Maryland |
| (240) 720- | 固話 | Gaithersburg | Global Crossing Local Services-md |
| (240) 722- | 固話 | Sandy Spring | Global Crossing Local Services-md |
| (240) 723- | 固話 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 724- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 725- | 固話 | Lexington Park | Verizon Maryland |
| (240) 727- | 手機 | Cumberland | New Cingular Wireless PCS - DC |
| (240) 731- | 手機 | Rockville | New Cingular Wireless PCS - DC |
| (240) 734- | 固話 | Hagerstown | Bandwidth.com Clec |
| (240) 737- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 743- | 固話 | Oxon Hill | Local Access LLC |
| (240) 744- | 固話 | Mount Rainier | Broadwing Communications. LLC |
| (240) 745- | 固話 | Damascus | Xo Maryland |
| (240) 747- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 750- | 手機 | Gaithersburg | New Cingular Wireless PCS - DC |
| (240) 751- | 固話 | Gaithersburg | Telcove Operations |
| (240) 752- | 固話 | Bethesda | Telcove Operations |
| (240) 753- | 固話 | Rockville | Telcove Operations |
| (240) 754- | 固話 | Waldorf | Level 3 Communications |
| (240) 755- | 固話 | Laurel | Comcast Phone Of Northern Maryland |
| (240) 757- | 固話 | Mount Rainier | Peerless Network Of Maryland |
| (240) 762- | 手機 | Mount Rainier | Cellco Partnership DBA Verizon Wireless |
| (240) 764- | 固話 | Chevy Chase | Xo Maryland |
| (240) 765- | 固話 | Chevy Chase | Xo Maryland |
| (240) 766- | 固話 | Chevy Chase | Xo Maryland |
| (240) 767- | 固話 | Capitol Heights | Cavalier East LLC |
| (240) 770- | 固話 | Oxon Hill | Comcast Phone Of Northern Maryland |
| (240) 772- | 手機 | Frederick | Cellco Partnership DBA Verizon Wireless |
| (240) 773- | 固話 | Rockville | Verizon Maryland |
| (240) 776- | 固話 | La Plata | Broadwing Communications. LLC |
| (240) 777- | 固話 | Rockville | Verizon Maryland |
| (240) 778- | 固話 | Chevy Chase | Xo Maryland |
| (240) 779- | 固話 | Sandy Spring | Cavalier East LLC |
| (240) 780- | 固話 | Gaithersburg | Broadwing Communications. LLC |
| (240) 782- | 固話 | Damascus | Global Crossing Local Services-md |
| (240) 783- | 手機 | Bethesda | Mte DBA Mte Paging Network |
| (240) 784- | 手機 | Myersville | Omnipoint Communications Cap Operations |
| (240) 786- | 固話 | Laurel | Broadwing Communications. LLC |
| (240) 787- | 固話 | Brandywine | Broadwing Communications. LLC |
| (240) 788- | 固話 | Oxon Hill | Broadwing Communications. LLC |
| (240) 790- | 固話 | Mount Rainier | Broadwing Communications. LLC |
| (240) 793- | 手機 | Gaithersburg | Sprint Spectrum L.p. |
| (240) 794- | 固話 | Callaway | Broadwing Communications. LLC |
| (240) 800- | 固話 | Chevy Chase | Core Communications |
| (240) 801- | 手機 | Gaithersburg | Cellco Partnership DBA Verizon Wireless |
| (240) 802- | 手機 | Bethesda | 365 Wireless |
| (240) 803- | 手機 | Cumberland | New Cingular Wireless PCS - DC |
| (240) 804- | 固話 | Newburg | Xo Maryland |
| (240) 812- | 固話 | Poolesville | Global Crossing Local Services-md |
| (240) 813- | 固話 | Gaithersburg | Atx Telecommunications Services, Ltd |
| (240) 818- | 固話 | Smithsburg | Verizon Maryland |
| (240) 821- | 固話 | Silver Spring | Lightwave Communications |
| (240) 823- | 固話 | Brandywine | Xo Maryland |
| (240) 826- | 固話 | Rockville | Verizon Maryland |
| (240) 832- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 833- | 固話 | Chevy Chase | Xo Maryland |
| (240) 837- | 固話 | Hughesville | Xo Maryland |
| (240) 838- | 手機 | Oxon Hill | Omnipoint Communications Cap Operations |
| (240) 839- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
| (240) 841- | 固話 | Laurel | Allegiance Telecom |
| (240) 842- | 固話 | Glenn Dale | Allegiance Telecom |
| (240) 843- | 固話 | College Park | Allegiance Telecom |
| (240) 844- | 固話 | Ridge | Xo Maryland |
| (240) 845- | 固話 | Chevy Chase | Xo Maryland |
| (240) 846- | 固話 | Clinton | Xo Maryland |
| (240) 848- | 手機 | Gaithersburg | Sprint Spectrum L.p. |
| (240) 855- | 手機 | Cabin John | Sprint Spectrum L.p. |
| (240) 857- | 固話 | Mount Rainier | Tw Telecom Of Maryland LLC |
| (240) 863- | 固話 | Laurel | Tw Telecom Of Maryland LLC |
| (240) 864- | 固話 | Rockville | Cavalier East LLC |
| (240) 865- | 固話 | Baltimore | Level 3 Communications |
| (240) 868- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 876- | 手機 | Bethesda | Sprint Spectrum L.p. |
| (240) 880- | 固話 | Chevy Chase | Broadwing Communications. LLC |
| (240) 882- | 手機 | Capitol Heights | Sprint Spectrum L.p. |
| (240) 883- | 固話 | Sandy Spring | Broadwing Communications. LLC |
| (240) 888- | 手機 | Rockville | New Cingular Wireless PCS - DC |
| (240) 892- | 固話 | Upper Marlboro | Broadwing Communications. LLC |
| (240) 893- | 手機 | Silver Spring | New Cingular Wireless PCS - DC |
| (240) 895- | 固話 | Lexington Park | Verizon Maryland |
| (240) 897- | 固話 | Mount Rainier | Broadwing Communications. LLC |
| (240) 898- | 固話 | Mount Rainier | Broadwing Communications. LLC |
| (240) 899- | 手機 | Bethesda | Omnipoint Communications Cap Operations |
| (240) 901- | Unknown | Centurylink Communications LLC | |
| (240) 903- | 固話 | Indian Head | Comcast Phone Of Northern Maryland |
| (240) 912- | 固話 | Gaithersburg | Us Lec Of Maryland |
| (240) 920- | 固話 | Cumberland | Level 3 Communications |
| (240) 925- | 手機 | Leonardtown | Cellco Partnership DBA Verizon Wireless |
| (240) 929- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 938- | 手機 | Ashton | Omnipoint Communications Cap Operations |
| (240) 949- | 固話 | Mount Rainier | Cavalier East LLC |
| (240) 964- | 固話 | Cumberland | Verizon Maryland |
| (240) 965- | 固話 | College Park | Paetec Communications |
| (240) 976- | Unknown | Baltimore-washington Telephone (bwt) | |
| (240) 979- | 固話 | Cumberland | Level 3 Communications |
| (240) 986- | 固話 | Nanjemoy | Xo Maryland |
| (240) 988- | 手機 | Beltsville | Sprint Spectrum L.p. |
| (240) 993- | 固話 | Indian Head | Xo Maryland |
| (240) 994- | 手機 | Rockville | Cellco Partnership DBA Verizon Wireless |
| (240) 997- | 手機 | Silver Spring | Cellco Partnership DBA Verizon Wireless |
友情提示：撥打長途電話的辦法很多，可以使用各通信運營商（包括中國電信、中國移動、中國聯通等）固定電話、移動手機或者上網電腦來實現通話功能，固定電話、移動手機可以直接撥打對方號碼也可以通過IP電話（又名VoIP電話、網絡電話）撥打，上網電腦可以免費與對方上網電腦通話也可以低價撥打對方固定電話、移動手機，請根據各自情況綜合考慮選用。
問題報告： 本站盡力為您提供最全面、仔細、準確的長途電話區號、手機號段歸屬、電話號碼查詢信息，但因為各個地區的合併、增加、撤銷、變更以及電話號碼方案變更、升位還有地名的多樣性等問題，難以避免出現錯誤或者過時信息，非常歡迎大家在使用中報告發現的問題或者告知更新內容。請直接在下面留言，本站核實後會馬上進行修改，以便對以後的瀏覽者有更好的幫助，非常感謝！
