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The US state of Washington 's 39 counties divided:
| county
|
Administrative headquarters
|
Population (2010)
|
Area in km²
|
| Adams County |
Ritzville |
18,728 |
1.925
|
| Asotin County |
Asotin |
21,623 |
636
|
| Benton County |
Prosser |
175.177 |
1,703
|
| Chelan County |
Wenatchee |
72,453 |
2,922
|
| Clallam County |
Port Angeles |
71,404 |
1,745
|
| Clark County |
Vancouver |
425.363 |
628
|
| Columbia County |
Dayton |
4,078 |
869
|
| Cowlitz County |
Kelso |
102.410 |
1,139
|
| Douglas County |
Waterville |
38,431 |
1,821
|
| Ferry County |
Republic |
7,551 |
2,204
|
| Franklin County |
Pasco |
78.163 |
1,242
|
| Garfield County |
Pomeroy |
2,266 |
710
|
| Grant County |
Ephrata |
89,120 |
2,681
|
| Grays Harbor County |
Montesano |
72,797 |
1.917
|
| Island County |
Coupeville |
78.506 |
209
|
| Jefferson County |
Port Townsend |
29,872 |
1,809
|
| King County |
Seattle |
1,931,249 |
2.126
|
| Kitsap County |
Port Orchard |
251.133 |
396
|
| Kittitas County |
Ellensburg |
40,915 |
2,297
|
| Klickitat County |
Goldendale |
20,318 |
872
|
| Lewis County |
Chehalis |
75,455 |
2,408
|
| Lincoln County |
Davenport |
10,570 |
2,311
|
| Mason County |
Shelton |
60,699 |
961
|
| Okanogan County |
Okanogan |
41,120 |
5,268
|
| Pacific County |
South Bend |
20,920 |
975
|
| Pend Oreille County |
Newport |
13.001 |
1,400
|
| Pierce County |
Tacoma |
795.225 |
1,676
|
| San Juan County |
Friday Harbor |
15,769 |
175
|
| Skagit County |
Mount Vernon |
116.901 |
1,735
|
| Skamania County |
Stevenson |
11,066 |
1,656
|
| Snohomish County |
Everett |
713.335 |
2,090
|
| Spokane County |
Spokane |
471.221 |
1,764
|
| Stevens County |
Colville |
43,531 |
2,478
|
| Thurston County |
Olympia |
252.264 |
727
|
| Wahkiakum County |
Cathlamet |
3,978 |
264
|
| Walla Walla County |
Walla Walla |
58,781 |
1,270
|
| Whatcom County |
Bellingham |
201.140 |
2.120
|
| Whitman County |
Colfax |
44,776 |
2.159
|
| Yakima County |
Yakima |
243.231 |
4,296
|