CA
United States geographic area code, in service since 1947-01-01. Part of the 213/323/738 overlay complex — ten-digit dialing required.
Created 714. Created 805. Created 818. Created 310. Created 323. Overlaid with 323, 738 .
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-04-16, most recent 2025-09-04.
Area codes serve rate-center geographies, not municipal boundaries. “CA” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | PACIFIC BELL | 138 | 17.3% |
| 02 | T-MOBILE USA, INC. | 120 | 15% |
| 03 | ONVOY, LLC - CA | 65 | 8.1% |
| 04 | NEW CINGULAR WIRELESS PCS, LLC | 58 | 7.2% |
| 05 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 44 | 5.5% |
| 06 | BANDWIDTH.COM CLEC, LLC - CA | 41 | 5.1% |
| 07 | METROPCS NETWORKS, LLC | 40 | 5% |
| 08 | FRACTEL, LLC | 34 | 4.3% |
| 09 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 27 | 3.4% |
| 10 | ONVOY SPECTRUM, LLC | 25 | 3.1% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 2023-05-16 NPA 738 to Overlay NPA 213/323 (California)
- 2016-08-09 NPA 213 and 323 Boundary Elimination Overlay (California) other
- 1947-01-01Area code 213 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2023-05-16 | PL-614 ↗ | NPA 738 to Overlay NPA 213/323 (California) |
| 2016-08-09 | PL-494 ↗ | NPA 213 and 323 Boundary Elimination Overlay (California) |