530
Area code
CA
United States geographic area code, in service since 1997-11-01. Part of the 530/837 overlay complex — ten-digit dialing required.
Statusin service
Introduced1997-11-01
JurisdictionCA, US
Local dialing1+10D
Time zonePacific
Last verified2026-09-17
Utilization 101% of assignable prefixes assigned
As of 09/17/2026
0%800 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 2001-01-25, most recent 2026-08-26.
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 | 182 | 22.8% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC | 67 | 8.4% |
| 03 | ONVOY, LLC - CA | 66 | 8.3% |
| 04 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 53 | 6.6% |
| 05 | LEVEL 3 COMMUNICATIONS, LLC - CA | 50 | 6.3% |
| 06 | T-MOBILE USA, INC. | 47 | 5.9% |
| 07 | BANDWIDTH.COM CLEC, LLC - CA | 43 | 5.4% |
| 08 | IP HORIZON LLC | 25 | 3.1% |
| 09 | CITIZENS TELECOM CA. DBA FRONTIER COM OF CA | 24 | 3% |
| 10 | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 23 | 2.9% |
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- 2023-08-08 NPA 837 to Overlay NPA 530 (California)
- 1997-11-01Area code 530 entered service (created from 916).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2023-08-08 | PL-621 ↗ | NPA 837 to Overlay NPA 530 (California) |
| 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 |
| 1998-01-05 | PL-108 ↗ | NPA Test Number Change for the New 530 Numbering Plan Area (NPA) in California |
| 1997-06-23 | PL-072 ↗ | NANP-Split of 916 (California) Numbering Plan Area (NPA) |