| Adams County | 5 | 5,324 | Othello School District, Ritzville School District, Lind School District, Washtucna School District, Benge School District |
| Asotin County | 2 | 3,152 | Clarkston School District, Asotin-Anatone School District |
| Benton County | 6 | 38,191 | Kennewick School District, Richland School District, Prosser School District, Kiona-Benton City School District, Finley School District, Paterson School District |
| Chelan County | 7 | 12,392 | Wenatchee School District, Cashmere School District, Lake Chelan School District, Cascade School District, Manson School District, Entiat School District, Stehekin School District |
| Clallam County | 5 | 10,662 | Quillayute Valley School District, Port Angeles School District, Sequim School District, Cape Flattery School District, Crescent School District |
| Clark County | 11 | 74,587 | All 11 Clark County districts → |
| Columbia County | 2 | 1,144 | Starbuck School District, Dayton School District |
| Cowlitz County | 6 | 17,066 | Longview School District, Kelso School District, Woodland School District, Castle Rock School District, Kalama School District, Toutle Lake School District |
| Douglas County | 7 | 7,916 | Eastmont School District, Bridgeport School District, Grand Coulee Dam School District, Waterville School District, Orondo School District, Mansfield School District, Palisades School District |
| Ferry County | 5 | 1,102 | Republic School District, Curlew School District, Inchelium School District, Orient School District, Keller School District |
| Franklin County | 5 | 24,834 | Pasco School District, Selah School District, North Franklin School District, Kahlotus School District, Star School District No. 054 |
| Garfield County | 1 | 343 | Pomeroy School District |
| Grant County | 9 | 20,461 | Moses Lake School District, Quincy School District, Ephrata School District, Wahluke School District, Royal School District, Warden School District, Soap Lake School District, Coulee-Hartline School District, Wilson Creek School District |
| Grays Harbor County | 13 | 10,564 | All 13 Grays Harbor County districts → |
| Island County | 4 | 11,440 | Oak Harbor School District, Lynden School District, South Whidbey School District, Coupeville School District |
| Jefferson County | 5 | 2,670 | Port Townsend School District, Chimacum School District, Quilcene School District, Brinnon School District, Queets-Clearwater School District |
| King County | 18 | 261,956 | All 18 King County districts → |
| Kitsap County | 6 | 33,727 | Central Kitsap School District, South Kitsap School District, North Kitsap School District, Bremerton School District, Bainbridge Island School District, Suquamish Tribal Education Department |
| Kittitas County | 6 | 5,387 | Ellensburg School District, Cle Elum-Roslyn School District, Kittitas School District, Thorp School District, Easton School District, Damman School District |
| Klickitat County | 10 | 4,924 | All 10 Klickitat County districts → |
| Lewis County | 13 | 12,548 | All 13 Lewis County districts → |
| Lincoln County | 8 | 2,233 | Reardan-Edwall School District, Davenport School District, Wilbur School District, Odessa School District, Almira School District, Harrington School District, Creston School District, Sprague School District |
| Mason County | 7 | 9,139 | Shelton School District, North Mason School District, Mary M Knight School District, Pioneer School District, Hood Canal School District, Grapeview School District, Southside School District |
| Okanogan County | 8 | 10,726 | Omak School District, Tonasket School District, Okanogan School District, Brewster School District, Methow Valley School District, Oroville School District, Pateros School District, Nespelem School District |
| Pacific County | 6 | 3,243 | South Bend School District, Ocean Beach School District, Raymond School District, Willapa Valley School District, Naselle-Grays River Valley School District, North River School District |
| Pend Oreille County | 3 | 1,825 | Newport School District, Cusick School District, Selkirk School District |
| Pierce County | 15 | 136,115 | All 15 Pierce County districts → |
| San Juan County | 4 | 1,817 | Orcas Island School District, San Juan Island School District, Lopez Island School District, Shaw Island School District |
| Skagit County | 7 | 18,231 | Mount Vernon School District, Sedro-Woolley School District, Burlington-Edison School District, Anacortes School District, Concrete School District, La Conner School District, Conway School District |
| Skamania County | 4 | 1,000 | Stevenson-Carson School District, Skamania School District, Mount Pleasant School District, Mill A School District |
| Snohomish County | 15 | 133,012 | All 15 Snohomish County districts → |
| Spokane County | 14 | 76,523 | All 14 Spokane County districts → |
| Stevens County | 12 | 6,473 | All 12 Stevens County districts → |
| Thurston County | 8 | 41,634 | North Thurston Public Schools, Olympia School District, Tumwater School District, Yelm School District, Rochester School District, Tenino School District, Rainier School District, Griffin School District |
| Wahkiakum County | 1 | 399 | Wahkiakum School District |
| Walla Walla County | 7 | 8,516 | Walla Walla Public Schools, College Place School District, Columbia (Walla Walla) School District, Waitsburg School District, Touchet School District, Prescott School District, Dixie School District |
| Whatcom County | 6 | 23,583 | Bellingham School District, Ferndale School District, Nooksack Valley School District, Blaine School District, Meridian School District, Mount Baker School District |
| Whitman County | 13 | 4,635 | All 13 Whitman County districts → |
| Yakima County | 14 | 48,201 | All 14 Yakima County districts → |