Census ACS 2023 · 39 counties
Largest Counties in Washington
Washington has 39 counties with Census data available. The largest is King County with a population of 2,262,713. County-level data is important because counties are the primary unit of local government in most states, responsible for courts, elections, public health, and infrastructure. Population distribution across counties reveals where growth is concentrated and where rural decline may be occurring.
Source: Census ACS 2023 5-Year Estimates
| # | County | Population | Median Income |
|---|---|---|---|
| 1 | Yakima County | 256,605 | $68,015 |
| 2 | Whitman County | 47,042 | $52,893 |
| 3 | Whatcom County | 228,432 | $80,989 |
| 4 | Walla Walla County | 62,102 | $72,212 |
| 5 | Wahkiakum County | 4,573 | $57,091 |
| 6 | Thurston County | 296,640 | $93,985 |
| 7 | Stevens County | 47,470 | $67,405 |
| 8 | Spokane County | 544,323 | $73,513 |
| 9 | Snohomish County | 834,648 | $107,982 |
| 10 | Skamania County | 12,276 | $90,085 |
| 11 | Skagit County | 130,407 | $85,474 |
| 12 | San Juan County | 18,266 | $83,682 |
| 13 | Pierce County | 924,106 | $96,632 |
| 14 | Pend Oreille County | 13,811 | $63,750 |
| 15 | Pacific County | 23,750 | $62,350 |
| 16 | Okanogan County | 42,811 | $60,293 |
| 17 | Mason County | 66,968 | $78,359 |
| 18 | Lincoln County | 11,271 | $71,227 |
| 19 | Lewis County | 83,925 | $69,690 |
| 20 | Klickitat County | 23,082 | $70,400 |
| 21 | Kittitas County | 44,736 | $69,928 |
| 22 | Kitsap County | 276,581 | $98,546 |
| 23 | King County | 2,262,713 | $122,148 |
| 24 | Jefferson County | 33,313 | $71,143 |
| 25 | Island County | 86,747 | $88,358 |
| 26 | Grays Harbor County | 76,397 | $63,539 |
| 27 | Grant County | 100,428 | $71,115 |
| 28 | Garfield County | 2,326 | $62,411 |
| 29 | Franklin County | 97,676 | $82,755 |
| 30 | Ferry County | 7,326 | $54,650 |
| 31 | Douglas County | 43,733 | $80,374 |
| 32 | Cowlitz County | 111,539 | $72,932 |
| 33 | Columbia County | 3,996 | $71,528 |
| 34 | Clark County | 510,516 | $94,948 |
| 35 | Clallam County | 77,593 | $67,999 |
| 36 | Chelan County | 79,518 | $78,306 |
| 37 | Benton County | 210,224 | $87,316 |
| 38 | Asotin County | 22,424 | $69,107 |
| 39 | Adams County | 20,690 | $65,042 |
More Rankings for Washington
Frequently Asked Questions
King County is the #1 ranked county in Washington by population, with a value of 2,262,713 according to Census ACS 2023 data.
Washington has 39 counties tracked in Census ACS 2023 data.
All data comes from the American Community Survey (ACS) 2023 5-Year estimates by the US Census Bureau.
Data from the American Community Survey 2023 5-Year estimates. Covers all counties in Washington.