The U.S. state of Washington has six telephone area codes serving five geographically distinct numbering plan areas (NPAs). In 1947, the state was assigned a single area code (206) until it was divided in 1957 with the creation of area code 509 to serve Eastern Washington.
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In 1995, 206 was split again to serve just the Puget Sound region after area code 360 was created for the remainder of Western Washington. In 1997, area code 425 was assigned to Seattle's Eastside and South Snohomish County suburbs and area code 253 for the Tacoma area, leaving 206 for just the city of Seattle, closely neighboring cities in King and Snohomish counties, and Bainbridge Island in Kitsap County.
| Area code | Year created | Parent NPA | Overlay | Numbering plan area |
|---|---|---|---|---|
| 206 | 1947 | – | 206/564 | Seattle, Shoreline, Lake Forest Park, Mercer Island, Bainbridge Island, Vashon Island |
| 360 | 1995 | 206 | 360/564 | Western Washington excluding most of the Seattle metropolitan area; includes Olympia, Kitsap County, Bellingham, and Vancouver |
| 564 | 2017 | 206 | 206/564 | NPA 206 |
| 2023 | 360 | 360/564 | NPA 360 | |
| 253 | 1997 | 206 | – | Southern Puget Sound region, including Tacoma, most of Pierce County, Auburn, and Federal Way |
| 425 | 1997 | 206 | – | suburbs north and east of Seattle; Eastside and southern Snohomish County, including Everett, Snoqualmie Pass, and Renton |
| 509 | 1957 | 206 | – | Eastern Washington, including Spokane, the Tri-Cities, Yakima, Walla Walla, and Wenatchee |
