Washington Counties by Land Area
Want to know about the largest to smallest counties in Washington, USA in terms of total land area? Check this resource Washington counties by land area to discover all the details regarding county map (boundary), and nearby counties. On the other hand, check Washington counties by population and Washington cities by population to know more about city and county based demographic details.
What is the largest county in Washington by land area?
Okanogan County is the largest county in Washington spanning 5266.19 square miles, with an additional 46.5 square miles of water area. Following Okanogan County, Yakima County ranks as the second largest in terms of land area, covering 4294.51 square miles, while Chelan County secures the position as the third largest county in Washington.
What is the smallest county by land area in Washington?
San Juan County is the smallest in Washington by total land area, covers about 173.91 square miles.
What is the largest county by population in Washington?
King County in Washington, USA, stands as the most populous county having 2,269,675 residents as per the 2022 census data.
What is the smallest county by population in Washington?
Garfield County is the smallest in Washington by total population, having 2,286 residents as per the 2022 census data.
| Rank | County in Washington | Land Area square miles | Water Area square miles | Total Area square miles |
|---|---|---|---|---|
| 1 | Okanogan County | 5,266 | 47 | 5,313 |
| 2 | Yakima County | 4,295 | 16 | 4,310 |
| 3 | Chelan County | 2,921 | 73 | 2,994 |
| 4 | Grant County | 2,680 | 112 | 2,791 |
| 5 | Stevens County | 2,477 | 63 | 2,540 |
| 6 | Lewis County | 2,403 | 34 | 2,436 |
| 7 | Lincoln County | 2,311 | 29 | 2,340 |
| 8 | Kittitas County | 2,297 | 36 | 2,333 |
| 9 | Ferry County | 2,203 | 54 | 2,257 |
| 10 | Whitman County | 2,159 | 19 | 2,178 |
| 11 | King County | 2,116 | 192 | 2,307 |
| 12 | Whatcom County | 2,108 | 397 | 2,505 |
| 13 | Snohomish County | 2,087 | 109 | 2,196 |
| 14 | Adams County | 1,925 | 5 | 1,930 |
| 15 | Grays Harbor County | 1,901 | 322 | 2,224 |
| 16 | Klickitat County | 1,872 | 33 | 1,904 |
| 17 | Douglas County | 1,819 | 30 | 1,849 |
| 18 | Jefferson County | 1,804 | 384 | 2,188 |
| 19 | Spokane County | 1,764 | 17 | 1,781 |
| 20 | Clallam County | 1,739 | 930 | 2,669 |
| 21 | Skagit County | 1,730 | 187 | 1,917 |
| 22 | Benton County | 1,700 | 60 | 1,760 |
| 23 | Pierce County | 1,668 | 137 | 1,805 |
| 24 | Skamania County | 1,658 | 28 | 1,687 |
| 25 | Pend Oreille County | 1,400 | 25 | 1,426 |
| 26 | Walla Walla County | 1,270 | 29 | 1,299 |
| 27 | Franklin County | 1,242 | 23 | 1,265 |
| 28 | Cowlitz County | 1,141 | 25 | 1,166 |
| 29 | Mason County | 960 | 91 | 1,051 |
| 30 | Pacific County | 933 | 293 | 1,227 |
| 31 | Columbia County | 869 | 5 | 873 |
| 32 | Thurston County | 723 | 52 | 774 |
| 33 | Garfield County | 711 | 7 | 718 |
| 34 | Asotin County | 636 | 4 | 640 |
| 35 | Clark County | 629 | 27 | 656 |
| 36 | Kitsap County | 395 | 171 | 566 |
| 37 | Wahkiakum County | 263 | 24 | 287 |
| 38 | Island County | 208 | 309 | 517 |
| 39 | San Juan County | 174 | 447 | 621 |