The median income of King County residents was $45,489 per year, adjusted for inflation. It had 882,028 households with a population of 2,195,502.
The county with the lowest median resident income in the state was Whitman County with $17,679 per year after adjusting for inflation – $27,810 less than King County. It had 17,999 households with a population of 49,231.
Washington counties by earnings per resident (2019)
| Rank | County | Earnings per resident |
|---|---|---|
| 1 | King County | $45,489 |
| 2 | Snohomish County | $40,501 |
| 3 | Thurston County | $37,076 |
| 4 | Kitsap County | $36,449 |
| 5 | Pierce County | $36,273 |
| 6 | Clark County | $36,268 |
| 7 | Island County | $33,871 |
| 8 | Benton County | $33,590 |
| 9 | San Juan County | $33,216 |
| 10 | Skagit County | $32,180 |
| 11 | Columbia County | $31,349 |
| 12 | Skamania County | $31,344 |
| 13 | Spokane County | $30,173 |
| 14 | Douglas County | $30,106 |
| 15 | Whatcom County | $29,769 |
| 16 | Jefferson County | $29,678 |
| 17 | Lincoln County | $29,446 |
| 18 | Franklin County | $28,942 |
| 19 | Chelan County | $28,892 |
| 20 | Mason County | $28,386 |
| 21 | Walla Walla County | $28,051 |
| 22 | Garfield County | $27,941 |
| 23 | Cowlitz County | $27,688 |
| 24 | Clallam County | $27,638 |
| 25 | Pend Oreille County | $27,528 |
| 26 | Asotin County | $27,238 |
| 27 | Wahkiakum County | $26,813 |
| 28 | Klickitat County | $26,430 |
| 29 | Lewis County | $26,381 |
| 30 | Grant County | $26,262 |
| 31 | Grays Harbor County | $26,117 |
| 32 | Kittitas County | $25,786 |
| 33 | Yakima County | $25,527 |
| 34 | Stevens County | $25,440 |
| 35 | Okanogan County | $24,978 |
| 36 | Pacific County | $24,234 |
| 37 | Adams County | $24,178 |
| 38 | Ferry County | $23,052 |
| 39 | Whitman County | $17,679 |
* All values are inflation-adjusted
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