350
Area code
CA
United States geographic area code, in service since 2022-11-28. Part of the 209/350 overlay complex — ten-digit dialing required.
Statusin service
Introduced2022-11-28
JurisdictionCA, US
Local dialing1+10D
Time zonePacific
Last verified2026-09-17
Utilization 12.8% of assignable prefixes assigned
As of 09/17/2026
0%101 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 2022-09-28, most recent 2026-08-21.
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 | ONVOY, LLC - CA | 20 | 19.8% |
| 02 | ONVOY SPECTRUM, LLC | 17 | 16.8% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC | 12 | 11.9% |
| 04 | MULTIPLE OCN LISTING | 9 | 8.9% |
| 05 | TERRA NOVA TELECOM INC. | 7 | 6.9% |
| 06 | T-MOBILE USA, INC. | 7 | 6.9% |
| 07 | COMMIO, LLC | 7 | 6.9% |
| 08 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 5 | 5% |
| 09 | 5 | 5% | |
| 10 | NUSO, LLC | 2 | 2% |
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- 2022-06-06 NPA 350 to Overlay NPA 209 (California)
- 2022-11-28Area code 350 entered service (created from 209).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2022-06-06 | PL-594 ↗ | NPA 350 to Overlay NPA 209 (California) |