39 Counties — washington
| County | Type | Population | Land area |
|---|
| adams | County | 16,428 | 1,925 sq mi |
| asotin | County | 20,551 | 636 sq mi |
| benton | County | 142,475 | 1,703 sq mi |
| chelan | County | 66,616 | 2,922 sq mi |
| clallam | County | 64,525 | 1,745 sq mi |
| clark | County | 345,238 | 628 sq mi |
| columbia | County | 4,064 | 869 sq mi |
| cowlitz | County | 92,948 | 1,139 sq mi |
| douglas | County | 32,603 | 1,821 sq mi |
| ferry | County | 7,260 | 2,204 sq mi |
| franklin | County | 49,347 | 1,242 sq mi |
| garfield | County | 2,397 | 711 sq mi |
| grant | County | 74,698 | 2,676 sq mi |
| grays harbor | County | 67,194 | 1,917 sq mi |
| island | County | 71,558 | 209 sq mi |
| jefferson | County | 25,953 | 1,809 sq mi |
| king | County | 1,737,034 | 2,126 sq mi |
| kitsap | County | 231,969 | 396 sq mi |
| kittitas | County | 33,362 | 2,297 sq mi |
| klickitat | County | 19,161 | 1,873 sq mi |
| lewis | County | 68,600 | 2,408 sq mi |
| lincoln | County | 10,184 | 2,311 sq mi |
| mason | County | 49,405 | 961 sq mi |
| okanogan | County | 39,564 | 5,268 sq mi |
| pacific | County | 20,984 | 975 sq mi |
| pend oreille | County | 11,732 | 1,401 sq mi |
| pierce | County | 700,820 | 1,676 sq mi |
| san juan | County | 14,077 | 175 sq mi |
| skagit | County | 102,979 | 1,735 sq mi |
| skamania | County | 9,872 | 1,657 sq mi |
| snohomish | County | 606,024 | 2,090 sq mi |
| spokane | County | 417,939 | 1,764 sq mi |
| stevens | County | 40,066 | 2,478 sq mi |
| thurston | County | 207,355 | 727 sq mi |
| wahkiakum | County | 3,824 | 264 sq mi |
| walla walla | County | 55,180 | 1,271 sq mi |
| whatcom | County | 166,814 | 2,120 sq mi |
| whitman | County | 40,740 | 2,159 sq mi |
| yakima | County | 222,581 | 4,296 sq mi |