Alphabetical List of All Counties in Washington


There are a total of 39 counties in the state of Washington. Among them, Clark County is the oldest one (established in 1845) while Pend Oreille County is the youngest (established in 1911).  With population of 1,931,249, King County is the most populated. The biggest county by land area is Okanogan County (13,644 km2) and the smallest is San Juan County (453 km2). Below please see all Washington counties which are listed in alphabetical order.

  1. Adams County, WA
  2. Asotin County, WA
  3. Benton County, WA
  4. Chelan County, WA
  5. Clallam County, WA
  6. Clark County, WA
  7. Columbia County, WA
  8. Cowlitz County, WA
  9. Douglas County, WA
  10. Ferry County, WA
  11. Franklin County, WA
  12. Garfield County, WA
  13. Grant County, WA
  14. Grays Harbor County, WA
  15. Island County, WA
  16. Jefferson County, WA
  17. King County, WA
  18. Kitsap County, WA
  19. Kittitas County, WA
  20. Klickitat County, WA
  21. Lewis County, WA
  22. Lincoln County, WA
  23. Mason County, WA
  24. Okanogan County, WA
  25. Pacific County, WA
  26. Pend Orielle County, WA
  27. Pierce County, WA
  28. San Juan County, WA
  29. Skagit County, WA
  30. Skamania County, WA
  31. Snohomish County, WA
  32. Spokane County, WA
  33. Stevens County, WA
  34. Thurston County, WA
  35. Wahkiakum County, WA
  36. Walla Walla County, WA
  37. Whatcom County, WA
  38. Whitman County, WA
  39. Yakima County, WA