This is a list of Washington county courthouses.
| County | Courthouse | Photo | Built | Location | Notes |
|---|---|---|---|---|---|
| Adams | Adams County Courthouse | 1941 | Ritzville, Washington | ||
| Asotin | Asotin County Courthouse | 1938 | Asotin, Washington | ||
| Benton | Benton County Courthouse | 1927 | Prosser, Washington | ||
| Chelan | Chelan County Courthouse | 1924 | Wenatchee, Washington | ||
| Clallam | Clallam County Courthouse | 1914 | Port Angeles, Washington | ||
| Clark | Clark County Courthouse | 1940 | Vancouver, Washington | ||
| Columbia | Columbia County Courthouse | 1887 | Dayton, Washington | It is the oldest courthouse in the Washington state | |
| Cowlitz | Cowlitz County Courthouse | 1923 | Kelso, Washington | ||
| Douglas | Douglas County Courthouse | 1905 | Waterville, Washington | ||
| Ferry | Ferry County Courthouse | 1936 | Republic, Washington | ||
| Franklin | Franklin County Courthouse | 1912 | Pasco, Washington | ||
| Garfield | Garfield County Courthouse | 1901 | Pomeroy, Washington | ||
| Grant | Grant County Courthouse | 1917 | Ephrata, Washington | ||
| Grays Harbor | Grays Harbor County Courthous | 1911 | Montesano, Washington | ||
| Island | Island County Courthouse | 1948 | Coupeville, Washington | ||
| Jefferson | Jefferson County Courthouse | 1890 | Port Townsend, Washington | ||
| King | King County Courthouse | 1916 | Seattle, Washington | ||
| Kitsap | Kitsap County Courthouse | 1932 | Port Orchard, Washington | ||
| Kittitas | Kittitas County Courthouse | 1955 | Ellensburg, Washington | ||
| Klickitat | Klickitat County Courthouse | 1941 | Goldendale, Washington | ||
| Lewis | Lewis County Courthouse | 1927 | Chehalis, Washington | ||
| Lincoln | Lincoln County Courthouse | 1897 | Davenport, Washington | ||
| Mason | Mason County Courthouse | 1929 | Shelton, Washington | ||
| Okanogan | Okanogan County Courthouse | 1916 | Okanogan, Washington | The National Register of Historic Places listing with reference number 95000805 | |
| Pacific | Pacific County Courthouse | 1910 | South Bend, Washington | ||
| Pend Oreille | Pend Oreille County Courthouse | 1915 | Newport, Washington | ||
| Pierce | Pierce County Courthouse (County-City Building) | 1958 | Tacoma, Washington | ||
| San Juan | San Juan County Courthouse | 1910 | Friday Harbor, Washington | ||
| Skagit | Skagit County Courthouse | 1924 | Mount Vernon, Washington | ||
| Skamania | Skamania County Courthouse | 1949 | Stevenson, Washington | ||
| Snohomish | Snohomish County Courthouse | 1967 | Everett, Washington | ||
| Spokane | Spokane County Courthouse | 1895 | Spokane, Washington | ||
| Stevens | Stevens County Courthouse | 1938 | Colville, Washington | ||
| Thurston | Thurston County Courthouse | 1930 | Olympia, Washington | ||
| Wahkiakum | Wahkiakum County Courthouse | 1921 | Cathlamet, Washington | ||
| Walla Walla | Walla Walla County Courthouse | 1916 | Walla Walla, Washington | ||
| Whatcom | Whatcom County Courthouse | 1950 | Bellingham, Washington | ||
| Whitman | Whitman County Courthouse | 1955 | Colfax, Washington | ||
| Yakima | Yakima County Courthouse | 1941, 1963 | Yakima, Washington |
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