559
Area code
CA
United States geographic area code, in service since 1998-11-14. Part of the 357/559 overlay complex — ten-digit dialing required.
Statusin service
Introduced1998-11-14
JurisdictionCA, US
Local dialing1+10D
Time zonePacific
Last verified2026-09-17
Utilization 100.6% of assignable prefixes assigned
As of 09/17/2026
0%797 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 2001-03-01, 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 | 182 | 22.8% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC | 123 | 15.4% |
| 03 | T-MOBILE USA, INC. | 56 | 7% |
| 04 | ONVOY, LLC - CA | 56 | 7% |
| 05 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 52 | 6.5% |
| 06 | LEVEL 3 COMMUNICATIONS, LLC - CA | 44 | 5.5% |
| 07 | BANDWIDTH.COM CLEC, LLC - CA | 36 | 4.5% |
| 08 | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 26 | 3.3% |
| 09 | METROPCS, INC. | 23 | 2.9% |
| 10 | FRONTIER CALIFORNIA INC. | 22 | 2.8% |
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- 2024-02-06 NPA 357 to Overlay NPA 559 (California)
- 1998-11-14Area code 559 entered service (created from 209).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2024-02-06 | PL-624 ↗ | NPA 357 to Overlay NPA 559 (California) |
| 1997-11-06 | PL-098 ↗ | NANP-Split of 209 (California) Numbering Plan Area (NPA) |