The median income of King County residents was $42,772 per year, adjusted for inflation. It had 865,627 households with a population of 2,163,257.
The county with the lowest median resident income in the state was Whitman County with $17,153 per year after adjusting for inflation – $25,619 less than King County. It had 17,910 households with a population of 48,593.
Washington counties by earnings per resident (2018)
| Rank | County | Earnings per resident |
|---|---|---|
| 1 | King County | $42,772 |
| 2 | Snohomish County | $38,522 |
| 3 | Thurston County | $35,954 |
| 4 | Pierce County | $34,523 |
| 5 | Kitsap County | $34,483 |
| 6 | Clark County | $34,463 |
| 7 | Island County | $31,912 |
| 8 | Benton County | $31,649 |
| 9 | San Juan County | $31,568 |
| 10 | Columbia County | $30,995 |
| 11 | Skagit County | $30,705 |
| 12 | Skamania County | $28,940 |
| 13 | Spokane County | $28,666 |
| 14 | Douglas County | $28,066 |
| 15 | Jefferson County | $27,941 |
| 16 | Chelan County | $27,575 |
| 17 | Franklin County | $27,453 |
| 18 | Whatcom County | $27,396 |
| 19 | Clallam County | $27,250 |
| 20 | Wahkiakum County | $27,215 |
| 21 | Lincoln County | $27,167 |
| 22 | Walla Walla County | $26,942 |
| 23 | Mason County | $26,869 |
| 24 | Asotin County | $26,656 |
| 25 | Pend Oreille County | $26,494 |
| 26 | Cowlitz County | $26,466 |
| 27 | Garfield County | $25,968 |
| 28 | Grant County | $25,692 |
| 29 | Kittitas County | $25,540 |
| 30 | Klickitat County | $25,410 |
| 31 | Lewis County | $25,381 |
| 32 | Stevens County | $25,114 |
| 33 | Grays Harbor County | $24,480 |
| 34 | Yakima County | $24,475 |
| 35 | Adams County | $23,809 |
| 36 | Okanogan County | $23,783 |
| 37 | Pacific County | $23,025 |
| 38 | Ferry County | $21,329 |
| 39 | Whitman County | $17,153 |
* All values are inflation-adjusted
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