925
Area code
Statusin service
Introduced1998-03-14
JurisdictionCA, US
Local dialing1+10D
Time zonePacific
Last verified2026-09-17
Utilization 82.7% of assignable prefixes assigned
As of 09/17/2026
0%655 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-01-26, most recent 2026-09-14.
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 | 206 | 31.5% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC | 48 | 7.3% |
| 03 | T-MOBILE USA, INC. | 44 | 6.7% |
| 04 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 39 | 6% |
| 05 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 38 | 5.8% |
| 06 | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 37 | 5.6% |
| 07 | LEVEL 3 COMMUNICATIONS, LLC - CA | 33 | 5% |
| 08 | ONVOY, LLC - CA | 32 | 4.9% |
| 09 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 25 | 3.8% |
| 10 | METROPCS, INC. | 23 | 3.5% |
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- 1998-03-14Area code 925 entered service (created from 510).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-01-08 | PL-556 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Lifeline) – supersedes PL-544 |
| 2020-08-17 | PL-544 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline |
| 1997-08-13 | PL-080 ↗ | Changes in Test Numbers and Effective Dates for California NPA Splits |
| 1997-05-19 | PL-061 ↗ | NANP- Split of 510 (California) Numbering Plan Area (NPA) |