21,763 rate centres across the United States and Canada. A rate centre is the telephone exchange area a number is homed to — the thing that decides which area codes can serve an address, and whether a call between two points is local.
| Rate centre | Region | Area codes | Incumbent | LATA | LIR | Blocks | Switches |
|---|---|---|---|---|---|---|---|
| Knox | PA | 814 | WINDSTREAM PENNSYLVANIA, INC. (0176) | 230 | — | 22 | ALNAPAALXHX, ALNAPAALXOX, ALNAPAALXTX +5 |
| Knox City | MO | 660 | MARK TWAIN RURAL TEL. CO. (1914) | 524 | — | 1 | HURDLAND |
| Knox City | TX | 940 | VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW (1163) | 548 | — | 6 | KNCYTXXARP0, KNOX CITY, SEYMOUR +2 |
| Knoxboro | NY | 315, 680 | VERNON TEL. CO., INC. (0133) | 136 | — | 12 | ESYRNYAW0MD, KNBONYXA0MD, SYRCNYSUX1Y +2 |
| Knoxville | IA | 641 | WINDSTREAM IOWA COMMUNICATIONS, INC. (1178) | 632 | — | 61 | BOONE, CNVLIABC1MD, DES MOINES +12 |
| Knoxville | IL | 309 | BRIGHTSPEED OF ILLINOIS, LLC (1057) | 977 | — | 24 | GLBGILXDDMD, GLBGILXDNMD, GLBGILXDXMD +5 |
| Knoxville | MO | 660 | GREEN HILLS TEL. CORP. (1890) | 524 | — | 12 | KSCYMO03X1X, KSCYMO55X2Z, TINA |
| Knoxville | OH | 740 | FRONTIER NORTH, INC. - OH (0615) | 324 | — | 9 | CLMBOH1125Z, CLMBOH1151Z, CLMDOH44IMD +3 |
| Knoxville | TN | 865 | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL (9419) | 474 | — | 2,202 | KNOXVILLE, KNOXVILLE BEARDEN, KNOXVILLE FOUNTAIN CITY +43 |
| Knoxville (Tioga) | PA | 582, 814 | VERIZON NORTH, INC. - PA (CONTEL) (0170) | 230 | — | 24 | ALNAPAACWMD, ALNAPAALXDX, ALNAPAALXGX +7 |
| Kobuk | AK | 907 | OTZ TEL. COOP., INC. (3019) | 832 | — | 11 | DEERING, KOBUK |
| Kodiak | AK | 907 | ACS OF THE NORTHLAND, INC. (3030) | 832 | — | 49 | ANCHORAGE, ANCRAKZAGT1, KODIAK +4 |
| Kokhanok | AK | 907 | ACS OF THE NORTHLAND, INC. (3030) | 832 | — | 1 | KAKHONAK |
| Kokomo | IN | 765 | INDIANA BELL TEL CO INC (9325) | 336 | — | 255 | INDIANAPOLIS, IPLSIN01XDZ, IPLSIN01XJZ +15 |
| Koliganek | AK | 907 | BRISTOL BAY TEL. COOP., INC. (3003) | 832 | — | 11 | KOLIGANEK |
| Kolob | UT | 435 | BEEHIVE TELEPHONE COMPANY, INC. (UTAH) (4611) | 660 | — | 1 | TOOELE |
| Komatke | AZ | 520 | GILA RIVER TELECOMM, INC. (2179) | 666 | — | 4 | CHANDLER, PHNXAZ19AMD |
| Konawa | OK | 580 | SOUTHWESTERN BELL (9533) | 536 | — | 31 | KONAWA, OKCYOKCEX9Y, OKCYOKCEXBZ +8 |
| Kongiganak | AK | 907 | UNITED UTILITIES, INC. (3023) | 832 | — | 1 | KONGIGANAK |
| Konnarock | VA | 276 | UNITED TELEPHONE-SOUTHEAST-VA DBA CENTURYLINK-VA (4511) | 956 | — | 15 | JHCYTNXC9MD, JHCYTNXCXAY, JHCYTNXCXPX +2 |
| Koon Kreek | TX | 430, 903 | BRIGHTSPEED OF EASTERN TEXAS, INC. (2084) | 552 | — | 22 | ATHNTXXATMD, DALLAS, DLLSTX37XWZ +2 |
| Koosharem | UT | 435 | SOUTH CENTRAL UTAH TEL. ASSN., INC. (2286) | 660 | — | 1 | PANGUITCH |
| Kooskia | ID | 208, 986 | QWEST CORPORATION (9638) | 676 | — | 26 | KOOSKIA, SPKNWA01X2Y, SPKNWA01XUX +6 |
| Kopperl | TX | 254 | TEXAS WINDSTREAM, LLC (2153) | 552 | — | 18 | DALLAS, DLLSTX97X9X, DLLSTXTAXTZ +2 |
| Kosciusko | MS | 662 | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL (9419) | 482 | — | 87 | GREENWOOD, JACKSON, JCSNMSCP41Z +13 |
| Kosciusko | TX | 830 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (2154) | 566 | — | 22 | KOSCIUSKO, SAN ANTONIO, SNANTXCA34Z +6 |
| Koshkonong | MO | 417 | BRIGHTSPEED OF MISSOURI, LLC (9787) | 522 | — | 12 | BASNMOXAXJX, BRANSON, KOSHKONONG +2 |
| Kosse | TX | 254 | BRIGHTSPEED OF EASTERN TEXAS, INC. (2084) | 556 | — | 22 | KLLNTXXARMD, KLLNTXXASMD, KOSSE +3 |
| Kotlik | AK | 907 | UNITED UTILITIES, INC. (3023) | 832 | — | 1 | KOTLIK |
| Kotzebue | AK | 907 | OTZ TEL. COOP., INC. (3019) | 832 | — | 3 | KOTZEBUE |
| Kountze | TX | 409 | SOUTHWESTERN BELL (9533) | 562 | — | 55 | BUMTTX14IMD, BUMTTXATOMD, BUMTTXTEX8X +7 |
| Kouts | IN | 219 | FRONTIER NORTH, INC.. - IN (0772) | 332 | — | 24 | EKHTINXAX0X, KOUTS, PLMOINXAXMD +9 |
| Kowaliga | AL | 334 | WINDSTREAM ALABAMA, INC. (0302) | 478 | — | 16 | HNVIAL96X5X, KOWALIGA, MTGMAL100MD +5 |
| Koyuk | AK | 907 | MUKLUK TEL. CO., INC. (3016) | 832 | — | 2 | KOYUK |
| Koyukuk | AK | 907 | ACS OF THE NORTHLAND, INC. (3030) | 832 | — | 1 | KOYUKUK |
| Krakow | WI | 920 | NORTHEAST TEL. CO. (0938) | 350 | — | 4 | APPLWI01X3Y, GNBYWIEL9MD, PULASKI |
| Kramer | ND | 701 | TURTLE MOUNTAIN COMMUN., INC. (1678) | 638 | — | 1 | ROLLA |
| Kremlin | MT | 406 | TRIANGLE TEL. COOP. ASSN., INC. (2257) | 648 | — | 1 | HAVRE |
| Kremlin | OK | 580 | SOUTHWESTERN BELL (9533) | 536 | — | 16 | KREMLIN, OKCYOKCEXBZ, OKCYOKCEXEZ +5 |
| Kremmling | CO | 970 | QWEST CORPORATION (9636) | 656 | — | 31 | DENVER, DNVRCO26XIX, DNVRCO26XUX +9 |
| Kresgeville | PA | 610 | PALMERTON TEL. CO. (0196) | 228 | — | 6 | KRESGEVILLE, PHILADELPHIA |
| Kress | TX | 806 | MID-PLAINS RURAL TEL. COOP., INC. (2112) | 544 | — | 1 | TULIA |
| Krotz Springs | LA | 337 | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL (9419) | 488 | — | 30 | ABVLLACT0MD, KROTZ SPRINGS, LFYTLA18X1X +7 |
| Krum | TX | 940 | BRIGHTSPEED OF TEXAS, INC. (2114) | 552 | — | 16 | ATHNTXXALMD, DALLAS, DCTRTXXATMD +5 |
| Kugaaruk | YT | 867 | — | 888 | — | 3 | KGRKVUAA0MD, KGRKVUAA1MD, KUGAARUK |
| Kugluktuk | YT | 867 | — | 888 | — | 3 | KGKKVU017MD, KGKKVUNDXMD, KUGLUKTUK |
| Kulm | ND | 701 | DICKEY RURAL TEL. COOP. (1611) | 636 | — | 1 | ELLENDALE |
| Kulpmont | PA | 272, 570 | VERIZON PENNSYLVANIA, INC. (9208) | 232 | — | 33 | BMBGPABLXMX, KULPMONT, PLAINS +8 |
| Kunkletown | PA | 610 | PALMERTON TEL. CO. (0196) | 228 | — | 7 | KUNKLETOWN, PHILADELPHIA, PHLAPAFGXXX |
| Kurten | TX | 979 | FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (4344) | 570 | — | 35 | BRYAN, BRYNTX05X0X, BRYNTXEH2MD +6 |
Many places are localities inside a larger rate centre and hold no numbers of their own, so they are not listed above — Clinton, Maryland is part of Washington Zone 16. The Area Codes tab resolves a place name through to whichever rate centre actually serves it.
The fields shown on the area code, rate centre and LATA pages, in plain language.
A means the whole prefix went to one carrier. This is why 512 has 783 prefixes but 6,011 rows — 512-555-1xxx and 512-555-2xxx can belong to different companies.One limitation worth knowing. All of this describes the block a number was issued from. Number portability means a number can be carried to another carrier while keeping its digits, so the carrier shown is the carrier of record for the block, not necessarily whoever serves that specific line today. Nothing in this data can tell you which — only a live portability lookup can.