| 206 | Washington (All of Bainbridge, Mercer, and Vashon islands, and the cities of Burien, Des Moines, Lake Forest Park, Normandy Park, Seattle, Sea-Tac, Shoreline, and Tukwila and some small unincorporated areas adjacent to these cities, also, parts of the cities of Woodway and Edmonds) More information at: Area Code 206 Phone Number Blocks |
| 253 | Washington (Lakewood, Tacoma, Auburn, Puyallup, Enumclaw, Spanaway and south Seattle suburbs) More information at: Area Code 253 Phone Number Blocks |
| 360 | Washington (Bellingham, Belfair, Bremerton, Aberdeen, Olympia and western Washington except the greater Seattle area, which uses the 206, 253, and 425 area codes) More information at: Area Code 360 Phone Number Blocks |
| 425 | Washington (north and east Seattle suburbs including Everett, Bellevue, Redmond, Renton, Kirkland, Bothell, Issaquah, Edmonds, Lynnwood and Mountlake Terrace) More information at: Area Code 425 Phone Number Blocks |
| 509 | Washington (All of eastern Washington, including Spokane, the Tri-Cities, Yakima, Wenatchee, Walla Walla, Pullman, and Ellensburg) More information at: Area Code 509 Phone Number Blocks |
| 564 | Washington (Western Washington)-planned. More information at: Area Code 564 Phone Number Blocks |
