California
Area codes
11
Rate centres
149
Carriers
70
Prefix blocks
41,504
A Local Access and Transport Area is the region a call is routed within before it becomes long-haul. The boundaries were drawn when the Bell System was broken up in 1984: a local carrier could carry a call inside its LATA, and a long-distance carrier had to take it across one. The division still shapes how calls are routed and rated today, which is why every prefix block on this site carries a LATA.
70 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| PACIFIC BELL | 9740 | 7,151 | 17.2% |
| ONVOY, LLC - CA | 649C | 5,732 | 13.8% |
| T-MOBILE USA, INC. | 6529 | 4,103 | 9.9% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 3,425 | 8.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 3,247 | 7.8% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 3,116 | 7.5% |
| METROPCS, INC. | 5562 | 2,335 | 5.6% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 2,215 | 5.3% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1,363 | 3.3% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 983 | 2.4% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 892 | 2.1% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 873 | 2.1% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 865 | 2.1% |
| ONVOY SPECTRUM, LLC | 624H | 701 | 1.7% |
| IP HORIZON LLC | 515J | 550 | 1.3% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 435 | 1.0% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 404 | 1.0% |
| FRACTEL, LLC | 965H | 309 | 0.7% |
| COMMIO, LLC | 939H | 252 | 0.6% |
| TELNYX LLC | 073H | 252 | 0.6% |
| SONIC TELECOM, LLC - CA | 433E | 215 | 0.5% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 204 | 0.5% |
| AT&T CORP. | 516C | 203 | 0.5% |
| TERRA NOVA TELECOM INC. | 145J | 180 | 0.4% |
| CENTURYLINK COMMUNICATIONS, LLC | 508J | 158 | 0.4% |
149 rate centres. search them all.