360
Area code
WA
United States geographic area code, in service since 1995-01-15. Part of the 360/564 overlay complex — ten-digit dialing required.
Statusin service
Introduced1995-01-15
JurisdictionWA, US
Local dialing10D
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 2025-09-19.
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 | 170 | 21.3% |
| 02 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA | 82 | 10.3% |
| 03 | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 81 | 10.1% |
| 04 | T-MOBILE USA, INC. | 66 | 8.3% |
| 05 | LEVEL 3 COMMUNICATIONS, LLC - WA | 61 | 7.6% |
| 06 | NEW CINGULAR WIRELESS PCS, LLC | 57 | 7.1% |
| 07 | TELEPORT COMMUNICATIONS AMERICA, LLC - WA | 49 | 6.1% |
| 08 | CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK | 35 | 4.4% |
| 09 | ONVOY, LLC - WA | 26 | 3.3% |
| 10 | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 25 | 3.1% |
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- 2016-06-28 NPA 564 to Overlay NPA 360 (Washington)
- 1995-01-15Area code 360 entered service (created from 206).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2016-06-28 | PL-492 ↗ | NPA 564 to Overlay NPA 360 (Washington) |
| 2001-08-29 | PL-298 ↗ | Suspension of 564 Overlay (Washington) |
| 2000-07-27 | PL-239 ↗ | NPA 564 to Overlay NPAs 206, 253, 360, and 425 (Washington) |
| 1999-10-29 | PL-196 ↗ | NANP- Overlay of 360 Numbering Plan Area (NPA) with 564 NPA (Washington) |