Below is a visual layout of all counties in the state of Washington. There are a total of 39 counties in the State of Washington.
List of Washington Counties
| County | Seat | Est. | Population |
| Adams County | Ritzville | 1883 | 18,728 |
| Asotin County | Asotin | 1883 | 21,623 |
| Benton County | Prosser | 1905 | 175,177 |
| Chelan County | Wenatchee | 1899 | 72,453 |
| Clallam County | Port Angeles | 1854 | 71,404 |
| Clark County | Vancouver | 1845 | 425,363 |
| Columbia County | Dayton | 1875 | 4,078 |
| Cowlitz County | Kelso | 1854 | 102,410 |
| Douglas County | Waterville | 1883 | 38,431 |
| Ferry County | Republic | 1899 | 7,551 |
| Franklin County | Pasco | 1883 | 78,163 |
| Garfield County | Pomeroy | 1881 | 2,266 |
| Grant County | Ephrata | 1909 | 89,120 |
| Grays Harbor County | Montesano | 1854 | 72,797 |
| Island County | Coupeville | 1853 | 78,506 |
| Jefferson County | Port Townsend | 1852 | 29,872 |
| King County | Seattle | 1852 | 1,931,249 |
| Kitsap County | Port Orchard | 1857 | 251,133 |
| Kittitas County | Ellensburg | 1883 | 40,915 |
| Klickitat County | Goldendale | 1859 | 20,318 |
| Lewis County | Chehalis | 1845 | 75,455 |
| Lincoln County | Davenport | 1883 | 10,570 |
| Mason County | Shelton | 1854 | 60,699 |
| Okanogan County | Okanogan | 1888 | 41,120 |
| Pacific County | South Bend | 1851 | 20,920 |
| Pend Oreille County | Newport | 1911 | 13,001 |
| Pierce County | Tacoma | 1852 | 795,225 |
| San Juan County | Friday Harbor | 1873 | 15,769 |
| Skagit County | Mount Vernon | 1883 | 116,901 |
| Skamania County | Stevenson | 1854 | 11,066 |
| Snohomish County | Everett | 1861 | 713,335 |
| Spokane County | Spokane | 1879 | 471,221 |
| Stevens County | Colville | 1863 | 43,531 |
| Thurston County | Olympia | 1852 | 252,264 |
| Wahkiakum County | Cathlamet | 1854 | 3,978 |
| Walla Walla County | Walla Walla | 1854 | 58,781 |
| Whatcom County | Bellingham | 1854 | 201,140 |
| Whitman County | Colfax | 1871 | 44,776 |
| Yakima County | Yakima | 1865 | 243,231 |