California
Area codes
3
Rate centres
81
Carriers
48
Prefix blocks
2,979
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.
48 carriers hold blocks here. The 25 largest are shown.
| Carrier | OCN | Blocks | Share |
|---|---|---|---|
| ONVOY, LLC - CA | 649C | 476 | 16.0% |
| PACIFIC BELL | 9740 | 337 | 11.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 312 | 10.5% |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 278 | 9.3% |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 231 | 7.8% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 184 | 6.2% |
| T-MOBILE USA, INC. | 6529 | 171 | 5.7% |
| CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 2308 | 137 | 4.6% |
| METROPCS, INC. | 5562 | 117 | 3.9% |
| IP HORIZON LLC | 515J | 106 | 3.6% |
| COMMIO, LLC | 939H | 72 | 2.4% |
| TERRA NOVA TELECOM INC. | 145J | 58 | 1.9% |
| TELNYX LLC | 073H | 49 | 1.6% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 45 | 1.5% |
| ONVOY SPECTRUM, LLC | 624H | 43 | 1.4% |
| AT&T CORP. | 516C | 42 | 1.4% |
| UTILITY TELECOM GROUP, LLC - CA | 9262 | 41 | 1.4% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 36 | 1.2% |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 35 | 1.2% |
| UNITED STATES CELLULAR - CA | 6261 | 30 | 1.0% |
| CHARTER IP ENABLED SERVICES, LLC | 792K | 29 | 1.0% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7128 | 21 | 0.7% |
| FRONTIER CALIFORNIA INC. | 4420 | 16 | 0.5% |
| HAPPY VALLEY TEL. CO. | 2321 | 11 | 0.4% |
| CITIZENS TELECOMM DBA FRONTIER COMM GOLDEN STATE | 3402 | 10 | 0.3% |
81 rate centres. search them all.