509
Area code
WA
United States geographic area code, in service since 1957-01-01. NANPA has flagged this area code for relief planning.
Statusin service
Introduced1957-01-01
JurisdictionWA, US
Local dialing10D
Time zonePacific
ReliefPlanning
Last verified2026-09-17
Utilization 98.2% of assignable prefixes assigned
As of 09/17/2026
0%778 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 2026-08-28.
Relief planning is under way for area code 509.
No planning letter has been issued yet for this cycle — this page will be updated the day one is published. Subscribe to the change-event feed to be notified.
Area codes serve rate-center geographies, not municipal boundaries. “WA” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | QWEST CORPORATION | 132 | 17% |
| 02 | NEW CINGULAR WIRELESS PCS, LLC | 77 | 9.9% |
| 03 | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 69 | 8.9% |
| 04 | ONVOY, LLC - WA | 66 | 8.5% |
| 05 | T-MOBILE USA, INC. | 63 | 8.1% |
| 06 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA | 59 | 7.6% |
| 07 | CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK | 37 | 4.8% |
| 08 | LEVEL 3 COMMUNICATIONS, LLC - WA | 32 | 4.1% |
| 09 | UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA | 29 | 3.7% |
| 10 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 21 | 2.7% |
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- 1957-01-01Area code 509 entered service.
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 |