Area
Code | Prefix | City/Switch Name
(Click for city search) | State/Prov.
Area Map | Telephone Company
Web link | Telco
Type | More
Info |
|---|
| 201 | 421 | FAIR LAWN | New Jersey | TELEPORT COMMUNICATIONS GROUP - NEW YORK - NJ | CAP | More |
| 202 | 421 | WSHNGTNZN1 | Maryland | SPRINT SPECTRUM L.P. | PCS | More |
| 203 | 421 | MADISON | Connecticut | SOUTHERN NEW ENGLAND TELEPHONE CO. | IND. TELCO | More |
| 204 | 421 | Winnipeg | Manitoba | Shaw Telecom Inc. | | More |
| 205 | 421 | BIRMINGHAM | Alabama | TCG MIDSOUTH, INC. - AL | CLEC | More |
| 206 | 421 | SEATTLE | Washington | QWEST CORPORATION | RBOC | More |
| 207 | 421 | PORTLAND | Maine | BELL ATLANTIC NYNEX MOBILE | WIRELESS PROV | More |
| 208 | 421 | TWIN FALLS | Idaho | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ID | WIRELESS PROV | More |
| 209 | 421 | MERCED | California | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 210 | 421 | SANANTONIO | Texas | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 212 | 421 | NWYRCYZN01 | New York | VERIZON NEW YORK, INC. | RBOC | More |
| 213 | 421 | LSAN DA 07 | California | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 214 | 421 | DALLAS | Texas | SOUTHWESTERN BELL | RBOC | More |
| 215 | 421 | PHPHSBZN33 | Pennsylvania | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 216 | 421 | CLEVELAND | Ohio | AMERITECH OHIO | RBOC | More |
| 217 | 421 | DECATUR | Illinois | AMERITECH ILLINOIS | RBOC | More |
| 218 | 421 | HIBBING | Minnesota | NEW CINGULAR WIRELESS PCS, LLC - IL | WIRELESS PROV | More |
| 225 | 421 | BATONROUGE | Louisiana | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 226 | 421 | Goderich | Ontario | Bragg Communications Inc. | CLEC | More |
| 229 | 421 | THOMASVL | Georgia | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA | WIRELESS PROV | More |
| 231 | 421 | TRAVERSECY | Michigan | CHARTER FIBERLINK - MICHIGAN, LLC - MI | | More |
| 234 | 421 | GIRARD | Ohio | AT&T LOCAL | CLEC | More |
| 240 | 421 | WSNGTNZN10 | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 248 | 421 | PONTIAC | Michigan | NEW CINGULAR WIRELESS PCS, LLC - IL | WIRELESS PROV | More |
| 250 | 421 | CRANBROOK | British Columbia | TELUS | IND. TELCO | More |
| 251 | 421 | MOBILE | Alabama | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL | WIRELESS PROV | More |
| 252 | 421 | COINJOCK | North Carolina | VIRGINIA PCS ALLIANCE, L.C. | WIRELESS PROV | More |
| 254 | 421 | TEMPLE | Texas | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 260 | 421 | FORT WAYNE | Indiana | FRONTIER NORTH, INC. - IN | IND. TELCO | More |
| 262 | 421 | CEDARBURG | Wisconsin | LEVEL 3 COMMUNICATIONS, LLC - WI | | More |
| 267 | 421 | LANSDALE | Pennsylvania | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | WIRELESS PROV | More |
| 269 | 421 | BERRIENSPG | Michigan | BANDWIDTH.COM CLEC, LLC - MI | | More |
| 270 | 421 | BOWLNGGREN | Kentucky | POWERTEL KENTUCKY LICENSES, INC. | | More |
| 276 | 421 | BASSETT | Virginia | COMCAST PHONE OF VIRGINIA, INC. - VA | CLEC | More |
| 281 | 421 | BAYTOWN | Texas | GTE-SW DBA VERIZON SW INC.-TX | IND. TELCO | More |
| 289 | 421 | Cooksville | Ontario | TELUS Integrated Communications | CLEC | More |
| 301 | 421 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 302 | 421 | WILMINGTON | Delaware | VERIZON DELAWARE, INC. | RBOC | More |
| 303 | 421 | DENVER | Colorado | QWEST CORPORATION | RBOC | More |
| 304 | 421 | CHRLSTNZN1 | West Virginia | VIRGINIA PCS ALLIANCE, L.C. | WIRELESS PROV | More |
| 305 | 421 | MIAMI | Florida | TCG SOUTH FLORIDA | CLEC | More |
| 306 | 421 | ESTEVAN | Saskatchewan | SaskTel Mobility | | More |
| 307 | 421 | CHEYENNE | Wyoming | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | WIRELESS PROV | More |
| 308 | 421 | MINDEN | Nebraska | SPRINT SPECTRUM L.P. | PCS | More |
| 309 | 421 | MACOMB | Illinois | COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL | CLEC | More |
| 310 | 421 | REDONDO | California | PAC - WEST TELECOMM, INC. | CLEC | More |
| 312 | 421 | CHICGOZN01 | Illinois | AMERITECH ILLINOIS | RBOC | More |
| 313 | 421 | DETROITZN5 | Michigan | NEW CINGULAR WIRELESS PCS, LLC - IL | WIRELESS PROV | More |
| 314 | 421 | ST LOUIS | Missouri | SOUTHWESTERN BELL | RBOC | More |
| 315 | 421 | SYRACUSE | New York | VERIZON NEW YORK, INC. | RBOC | More |
| 316 | 421 | TOWANDA | Kansas | SPRINT SPECTRUM L.P. | PCS | More |
| 317 | 421 | SHELBYVL | Indiana | AMERITECH INDIANA | RBOC | More |
| 318 | 421 | MONTEREY | Louisiana | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 319 | 421 | SHELL ROCK | Iowa | MCC TELEPHONY OF IOWA, LLC - IA | | More |
| 320 | 421 | ALEXANDRIA | Minnesota | LEVEL 3 COMMUNICATIONS, LLC - MN | | More |
| 321 | 421 | EAU GALLIE | Florida | US LEC OF FLORIDA, INC. | CLEC | More |
| 323 | 421 | LSAN DA 12 | California | PACIFIC BELL | RBOC | More |
| 330 | 421 | MEDINA | Ohio | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | WIRELESS PROV | More |
| 334 | 421 | TUSKEGEE | Alabama | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL | WIRELESS PROV | More |
| 336 | 421 | ANDERSON | North Carolina | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | RBOC | More |
| 337 | 421 | LK CHARLES | Louisiana | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | RBOC | More |
| 347 | 421 | NWYRCYZN08 | New York | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 360 | 421 | MT VERNON | Washington | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 401 | 421 | PROVIDENCE | Rhode Island | VERIZON NEW ENGLAND INC. | RBOC | More |
| 402 | 421 | LINCOLN | Nebraska | WINDSTREAM NEBRASKA, INC. | IND. TELCO | More |
| 403 | 421 | EDMONTON | Alberta | Rogers Communications Partnership (Wireless) | WIRELESS PROV | More |
| 404 | 421 | ATLANTA | Georgia | POWERTEL ATLANTA LICENSES, INC. | WIRELESS PROV | More |
| 405 | 421 | SHAWNEE | Oklahoma | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | | More |
| 406 | 421 | SOMILES CY | Montana | RANGE TELEPHONE COOPERATIVE, INC. | IND. TELCO | More |
| 407 | 421 | ORLANDO | Florida | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 408 | 421 | SNJS NORTH | California | NEW CINGULAR WIRELESS PCS, LLC | WIRELESS PROV | More |
| 409 | 421 | KIRBYVILLE | Texas | AWESOME PAGING, INC. | WIRELESS PROV | More |
| 410 | 421 | SEVERNA PK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 412 | 421 | PTTSBGZON1 | Pennsylvania | VERIZON PENNSYLVANIA, INC. | RBOC | More |
| 414 | 421 | MILWAUKZN3 | Wisconsin | AMERITECH WISCONSIN | RBOC | More |
| 415 | 421 | SNFC CNTRL | California | PACIFIC BELL | RBOC | More |
| 416 | 421 | TORONTO | Ontario | Bell Canada | IND. TELCO | More |
| 417 | 421 | AVILLA | Missouri | CD TELECOMMUNICATIONS, LLC - MO | | More |
| 418 | 421 | Sainte-Marie-de-Bea | Quebec | Fido Solutions Inc. | | More |
| 419 | 421 | FINDLAY | Ohio | AMERITECH OHIO | RBOC | More |
| 423 | 421 | CHATTNOOGA | Tennessee | SPRINT SPECTRUM L.P. | PCS | More |
| 425 | 421 | KIRKLAND | Washington | LEVEL 3 COMMUNICATIONS, LLC - WA | CLEC | More |
| 434 | 421 | DANVILLE | Virginia | SPRINT SPECTRUM L.P.- VA | PCS | More |
| 435 | 421 | BEAVER | Utah | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | WIRELESS PROV | More |
| 440 | 421 | HILLCREST | Ohio | TIME WARNER CABLE INFORMATION SVCS (OHIO) - OH | | More |
| 443 | 421 | FORK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 450 | 421 | Joliette | Quebec | TELUS Mobility | PCS | More |
| 469 | 421 | ALLEN | Texas | LEVEL 3 COMMUNICATIONS, LLC - TX | CLEC | More |
| 480 | 421 | PHOENIX | Arizona | QWEST CORPORATION | RBOC | More |
| 484 | 421 | PHPHSBZN22 | Pennsylvania | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - PA | CLEC | More |
| 501 | 421 | LITTLEROCK | Arkansas | TELCOVE INVESTMENT, LLC - AR | CLEC | More |
| 502 | 421 | LOUISVILLE | Kentucky | AMERICAN MESSAGING (AM), INC. | | More |
| 503 | 421 | PORTLAND | Oregon | SPRINT SPECTRUM L.P. | PCS | More |
| 504 | 421 | NEWORLEANS | Louisiana | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA | WIRELESS PROV | More |
| 505 | 421 | EL VALLE | New Mexico | E.N.M.R. TELEPHONE COOPERATIVE | IND. TELCO | More |
| 506 | 421 | St. Leonard | New Brunswick | Aliant Telecom(NB) | IND. TELCO | More |
| 507 | 421 | ROCHESTER | Minnesota | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN | | More |
| 508 | 421 | WORCESTER | Massachusetts | VERIZON NEW ENGLAND INC. | RBOC | More |
| 509 | 421 | WENATCHEE | Washington | NEW CINGULAR WIRELESS PCS, LLC | WIRELESS PROV | More |
| 510 | 421 | OKLD MN-PD | California | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | WIRELESS PROV | More |
| 512 | 421 | AUSTIN | Texas | SOUTHWESTERN BELL | RBOC | More |
| 513 | 421 | CINCINNATI | Ohio | CINCINNATI BELL, INC. | IND. TELCO | More |
| 514 | 421 | ROXBORO | Quebec | Bell Canada | IND. TELCO | More |
| 515 | 421 | CALLENDER | Iowa | WINDSTREAM IT-COMM, LLC - IA | | More |
| 516 | 421 | HUNTINGTON | New York | BELL ATLANTIC NY | RBOC | More |
| 517 | 421 | CLARE | Michigan | PHONE MICHIGAN | CLEC | More |
| 518 | 421 | ALBANY | New York | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 519 | 421 | WOODSTOCK | Ontario | Bell Canada | IND. TELCO | More |
| 520 | 421 | CASAGRANDE | Arizona | QWEST CORPORATION | RBOC | More |
| 530 | 421 | KNIGHTSLDG | California | PAC - WEST TELECOMM, INC. | CLEC | More |
| 540 | 421 | HARRISONBG | Virginia | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA | WIRELESS PROV | More |
| 541 | 421 | LONG CREEK | Oregon | CENTURYTEL OF OREGON, INC. DBA CENTURYLINK | IND. TELCO | More |
| 559 | 421 | FRESNO | California | PAC - WEST TELECOMM, INC. | CLEC | More |
| 561 | 421 | FORT PIERCE | Florida | NETWORK SERVICES LLC (TSR) | WIRELESS PROV | More |
| 562 | 421 | LAKEWOOD | California | VERIZON CALIFORNIA INC.-CA (GTE) | IND. TELCO | More |
| 563 | 421 | DAVENPORT | Iowa | QWEST CORPORATION | RBOC | More |
| 570 | 421 | STROUDSBG | Pennsylvania | VERIZON PENNSYLVANIA, INC. | RBOC | More |
| 571 | 421 | WSNGTNZN17 | Virginia | LEVEL 3 COMMUNICATIONS, LLC - VA | CLEC | More |
| 573 | 421 | DEXTER | Missouri | NEW CINGULAR WIRELESS PCS, LLC - IL | WIRELESS PROV | More |
| 575 | 421 | EL VALLE | New Mexico | E.N.M.R. TELEPHONE COOPERATIVE | IND. TELCO | More |
| 580 | 421 | ADA | Oklahoma | SOUTHWESTERN BELL | RBOC | More |
| 581 | 421 | St-Eleuthere | Quebec | Videotron General Partnership | CLEC | More |
| 585 | 421 | FAIRPORT | New York | FRONTIER TELEPHONE OF ROCHESTER INC | IND. TELCO | More |
| 586 | 421 | MT CLEMENS | Michigan | AMERITECH MICHIGAN | RBOC | More |
| 601 | 421 | JACKSON | Mississippi | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 602 | 421 | PHOENIX | Arizona | NEW CINGULAR WIRELESS PCS, LLC | WIRELESS PROV | More |
| 603 | 421 | DERRY | New Hampshire | NO NEW ENGLAND TEL OP DBA FAIRPOINT COMM - NH | RBOC | More |
| 604 | 421 | VANCOUVER | British Columbia | TELUS | IND. TELCO | More |
| 605 | 421 | SALEM | South Dakota | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | WIRELESS PROV | More |
| 608 | 421 | MADISON | Wisconsin | 365 WIRELESS, LLC | | More |
| 609 | 421 | TRENTON | New Jersey | VERIZON NEW JERSEY, INC. | RBOC | More |
| 610 | 421 | EMMAUS | Pennsylvania | RCN TELECOM SERVICE OF PENNSYLVANIA, INC. | CLEC | More |
| 613 | 421 | Ottawa-Hull | Ontario | Rogers Communications Partnership (Cable) | | More |
| 614 | 421 | COLUMBUS | Ohio | AMERITECH OHIO | RBOC | More |
| 615 | 421 | NASHVILLE | Tennessee | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | RBOC | More |
| 616 | 421 | LOWELL | Michigan | BROOKS FIBER COMMUNICATIONS OF MICHIGAN - MI | CAP | More |
| 617 | 421 | BOSTON | Massachusetts | VERIZON NEW ENGLAND INC. | RBOC | More |
| 618 | 421 | ROBINSON | Illinois | CELLULAR PROPERTIES, INC. | WIRELESS PROV | More |
| 619 | 421 | CHULAVISTA | California | PACIFIC BELL | RBOC | More |
| 620 | 421 | PARSONS | Kansas | SOUTHWESTERN BELL | RBOC | More |
| 626 | 421 | PSDN PSDN | California | METROPCS NETWORKS, LLC | | More |
| 630 | 421 | NORTHBROOK | Illinois | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | WIRELESS PROV | More |
| 631 | 421 | HUNTINGTON | New York | VERIZON NEW YORK, INC. | RBOC | More |
| 641 | 421 | MASON CITY | Iowa | QWEST CORPORATION | RBOC | More |
| 646 | 421 | NWYRCYZN01 | New York | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 650 | 421 | SAN JOSE | California | U.S. TELEPACIFIC CORP. - CA | CLEC | More |
| 661 | 421 | BKFD MAIN | California | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 662 | 421 | TUPELO | Mississippi | METROCALL | WIRELESS PROV | More |
| 678 | 421 | NORCROSS | Georgia | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | RBOC | More |
| 681 | 421 | FLEMINGTON | West Virginia | CORETEL VIRGINIA, LLC - WV | | More |
| 701 | 421 | NEW TOWN | North Dakota | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ND | WIRELESS PROV | More |
| 702 | 421 | LAS VEGAS | Nevada | YMAX COMMUNICATIONS CORP. - NV | | More |
| 703 | 421 | HERNDON | Virginia | VERIZON VIRGINIA, INC. | RBOC | More |
| 704 | 421 | CHARLOTTE | North Carolina | AT&T LOCAL | CLEC | More |
| 705 | 421 | Chelmsford | Ontario | Bell Aliant Regional Communications | | More |
| 706 | 421 | AUGUSTA | Georgia | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 707 | 421 | FAIRFIELD | California | PACIFIC BELL | RBOC | More |
| 708 | 421 | NORTHBROOK | Illinois | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | WIRELESS PROV | More |
| 709 | 421 | Triton | Newfoundland | Aliant Telecom (Mobility) | | More |
| 712 | 421 | SLOAN | Iowa | NORTHWEST IOWA TELEPHONE, LLC | IND. TELCO | More |
| 713 | 421 | HOUSTON | Texas | TELETOUCH COMMUNICATIONS, INC. | WIRELESS PROV | More |
| 714 | 421 | HUNTINGTON BEACH | California | LEVEL 3 COMMUNICATIONS, LLC - CA | CLEC | More |
| 715 | 421 | WISCONSIN RAPIDS | Wisconsin | WOOD COUNTY TELEPHONE CO. | IND. TELCO | More |
| 716 | 421 | PERINTON | New York | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | WIRELESS PROV | More |
| 717 | 421 | HARRISBURG CITY ZON | Pennsylvania | SPRINT SPECTRUM L.P.- PA | PCS | More |
| 718 | 421 | NYCZ 7 | New York | VERIZON NEW YORK, INC. | RBOC | More |
| 719 | 421 | EL PASO | Colorado | NEW CINGULAR WIRELESS PCS, LLC | WIRELESS PROV | More |
| 720 | 421 | DENVER | Colorado | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 724 | 421 | SLIPPERY ROCK | Pennsylvania | CONSOLIDATED COMMUNICATIONS ENTERPRISE SERVICES-PA | CLEC | More |
| 727 | 421 | CLEARWATER | Florida | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 731 | 421 | JACKSON | Tennessee | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | RBOC | More |
| 732 | 421 | TETERBORO | New Jersey | SPRINT SPECTRUM L.P. | PCS | More |
| 734 | 421 | LIVONIA | Michigan | AMERITECH MICHIGAN | RBOC | More |
| 740 | 421 | CAMBRIDGE | Ohio | LEVEL 3 COMMUNICATIONS, LLC - OH | CLEC | More |
| 757 | 421 | HICKORY | Virginia | VERIZON SOUTH INC.-VA (CONTEL) | IND. TELCO | More |
| 760 | 421 | OCEANSIDE: OCEANSID | California | MPOWER COMMUNICATIONS CORP - CA | CLEC | More |
| 763 | 421 | ANOKA | Minnesota | QWEST CORPORATION | RBOC | More |
| 765 | 421 | LAFAYETTE | Indiana | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN | WIRELESS PROV | More |
| 770 | 421 | MARIETTA | Georgia | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | RBOC | More |
| 772 | 421 | FORT PIERCE | Florida | AMERICAN MESSAGING SERVICES, LLC | WIRELESS PROV | More |
| 773 | 421 | CHICAGO | Illinois | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | WIRELESS PROV | More |
| 774 | 421 | FRAMINGHAM | Massachusetts | BROADVIEW NETWORKS, INC. - MA | | More |
| 775 | 421 | WINNEMUCCA | Nevada | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NV | WIRELESS PROV | More |
| 778 | 421 | Port Alberni | British Columbia | Shaw Telecom Inc. | | More |
| 780 | 421 | EDMONTON | Alberta | TELUS | IND. TELCO | More |
| 781 | 421 | CAMBRIDGE | Massachusetts | AT&T LOCAL | CLEC | More |
| 785 | 421 | HILL CITY | Kansas | RURAL TELEPHONE SERVICE CO., INC. | IND. TELCO | More |
| 786 | 421 | MIAMI | Florida | ABC PAGING CITY BEEPERS, INC. | WIRELESS PROV | More |
| 787 | 421 | GUAYNABO | Puerto Rico | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 801 | 421 | MIDVALE | Utah | XO UTAH, INC. | CLEC | More |
| 802 | 421 | CASTLETON | Vermont | GLOBAL NAPS, INC. - VT | | More |
| 803 | 421 | CAMDEN | South Carolina | DELTACOM, INC. - SC | CLEC | More |
| 804 | 421 | RICHMOND | Virginia | CAVALIER TELEPHONE, LLC | CLEC | More |
| 805 | 421 | LOS ANGELES | California | TW TELECOM OF CALIFORNIA LP - CA | CLEC | More |
| 806 | 421 | DUMAS | Texas | LEVEL 3 COMMUNICATIONS, LLC - TX | CLEC | More |
| 808 | 421 | PUULOA | Hawaii | HAWAIIAN TELCOM, INC. - HI | IND. TELCO | More |
| 812 | 421 | EVANSVILLE | Indiana | AMERITECH INDIANA | RBOC | More |
| 813 | 421 | TAMPACEN | Florida | BANDWIDTH.COM CLEC, LLC - FL | | More |
| 814 | 421 | JOHNSTOWN | Pennsylvania | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | WIRELESS PROV | More |
| 815 | 421 | HERSCHER | Illinois | AMERITECH ILLINOIS | RBOC | More |
| 816 | 421 | KANSAS CITY MCGEE | Missouri | SOUTHWESTERN BELL | RBOC | More |
| 817 | 421 | GRAPEVINE | Texas | GTE-SW DBA VERIZON SW INC.-TX | IND. TELCO | More |
| 818 | 421 | SHERMAN OAKS | California | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | WIRELESS PROV | More |
| 819 | 421 | St-Jovite | Quebec | Bell Mobility | WIRELESS PROV | More |
| 828 | 421 | FRANKLIN | North Carolina | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NC | WIRELESS PROV | More |
| 830 | 421 | SAN ANTONIO | Texas | SPRINT SPECTRUM L.P. | PCS | More |
| 831 | 421 | SANTA CRUZ | California | PACIFIC BELL | RBOC | More |
| 832 | 421 | HOUSTON | Texas | NEW CINGULAR WIRELESS PCS, LLC - IL | WIRELESS PROV | More |
| 843 | 421 | WEST MYRTLE BEACH | South Carolina | NEW CINGULAR WIRELESS PCS, LLC - GA | WIRELESS PROV | More |
| 845 | 421 | MIDDLETOWN | New York | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | WIRELESS PROV | More |
| 847 | 421 | NORTHBROOK | Illinois | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | WIRELESS PROV | More |
| 850 | 421 | TALLAHASSEE | Florida | EMBARQ FLORIDA INC. (CENTRAL) DBA CENTURYLINK | IND. TELCO | More |
| 856 | 421 | PORT NORRIS | New Jersey | NETCARRIER TELECOM, INC. - NJ | | More |
| 859 | 421 | LEXINGTON | Kentucky | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KY | WIRELESS PROV | More |
| 860 | 421 | CONNECTICUT | Connecticut | TELEPORT COMMUNICATIONS GROUP - NEW YORK - CT | CAP | More |
| 863 | 421 | HAINES CITY | Florida | VERIZON FLORIDA INC. | IND. TELCO | More |
| 864 | 421 | GREENVILLE | South Carolina | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | RBOC | More |
| 870 | 421 | MOUNTAIN HOME | Arkansas | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR | WIRELESS PROV | More |
| 901 | 421 | MEMPHIS | Tennessee | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | RBOC | More |
| 902 | 421 | HALIFAX | Nova Scotia | Aliant Telecom (NS) | IND. TELCO | More |
| 903 | 421 | LONGVIEW | Texas | GTE-SW DBA VERIZON SW INC.-TX | IND. TELCO | More |
| 904 | 421 | JACKSONVILLE | Florida | US LEC OF FLORIDA, INC. | CLEC | More |
| 905 | 421 | SOUTH PICKERING | Ontario | Bell Canada | IND. TELCO | More |
| 906 | 421 | SKANDIA | Michigan | PENINSULA FIBER NETWORK, LLC - MI | | More |
| 908 | 421 | NEW BRUNSWICK | New Jersey | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ | WIRELESS PROV | More |
| 909 | 421 | RIALTO | California | PACIFIC BELL | RBOC | More |
| 910 | 421 | WALLACE | North Carolina | ALEC, LLC - NC | CLEC | More |
| 912 | 421 | SAVANNAH | Georgia | BROADVOX-CLEC, LLC - GA | | More |
| 914 | 421 | WCHZ 8 | New York | VERIZON NEW YORK, INC. | RBOC | More |
| 916 | 421 | SACRAMENTO | California | PACIFIC BELL | RBOC | More |
| 917 | 421 | NEW YORK | New York | TELEPORT COMMUNICATIONS GROUP - NY | CAP | More |
| 918 | 421 | MCALESTER | Oklahoma | SOUTHWESTERN BELL | RBOC | More |
| 919 | 421 | ZEBULON | North Carolina | WINDSTREAM COMMUNICATIONS, INC. - NC | CLEC | More |
| 920 | 421 | BAILEYSHBR | Wisconsin | NEW CELL, INC. DBA CELLCOM | WIRELESS PROV | More |
| 925 | 421 | CONCORD | California | BANDWIDTH.COM CLEC, LLC - CA | | More |
| 928 | 421 | WINSLOW | Arizona | BANDWIDTH.COM CLEC, LLC - AZ | | More |
| 929 | 421 | NWYRCYZN08 | New York | VOXBEAM TELECOMMUNICATIONS INC. - NY | | More |
| 931 | 421 | SEWANEE | Tennessee | NETWORK TELEPHONE CORPORATION - TN | | More |
| 937 | 421 | JACKSON CENTER | Ohio | UNITED TEL. CO. OF OHIO - CENTURYLINK | IND. TELCO | More |
| 940 | 421 | MUNDAY | Texas | SANTA ROSA TELEPHONE COOPERATIVE, INC. | CLEC | More |
| 941 | 421 | FORT MEYERS | Florida | AT&T LOCAL | CLEC | More |
| 949 | 421 | SANTA ANA | California | XO CALIFORNIA, INC. | CLEC | More |
| 951 | 421 | MORENO | California | T-MOBILE USA, INC. | WIRELESS PROV | More |
| 954 | 421 | DEERFIELD BEACH | Florida | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | RBOC | More |
| 956 | 421 | HARLINGEN | Texas | SOUTHWESTERN BELL | RBOC | More |
| 970 | 421 | STEAMBOSPG | Colorado | UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS | | More |
| 971 | 421 | BRENHAM | Texas | SOUTHWESTERN BELL - TX | RBOC | More |
| 972 | 421 | DALLAS (ACSI) | Texas | TW TELECOM OF TEXAS LLC - TX | CLEC | More |
| 973 | 421 | NEWARK | New Jersey | VERIZON NEW JERSEY, INC. | RBOC | More |
| 978 | 421 | BOSTON | Massachusetts | TELEPORT COMMUNICATIONS GROUP - BOSTON | CAP | More |
| 979 | 421 | BRENHAM | Texas | SOUTHWESTERN BELL | RBOC | More |
| 989 | 421 | CLARE | Michigan | PHONE MICHIGAN | CLEC | More |
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