| County | Average Income |
| King |  $39,664 |
| San Juan | $38,636 |
| Snohomish | $31,310 |
| Kitsap | $31,287 |
| Island | $30,601 |
| Thurston | $30,153 |
| Jefferson | $28,723 |
| Skamania | $28,389 |
| Pierce | $28,187 |
| Benton | $28,171 |
| Clark | $27,885 |
| Skagit | $27,395 |
| Garfield | $27,217 |
| Columbia | $26,767 |
| Whatcom | $26,504 |
| Spokane | $25,891 |
| Clallam | $25,747 |
| Chelan | $25,581 |
| Lincoln | $25,154 |
| Wahkiakum | $25,060 |
| Asotin | $24,353 |
| Pacific | $23,895 |
| Walla Walla | $23,698 |
| Mason | $23,682 |
| Cowlitz | $23,572 |
| Douglas | $22,870 |
| Pend Oreille | $22,647 |
| Kittitas | $22,542 |
| Lewis | $22,246 |
| Stevens | $21,928 |
| Grays Harbor | $21,897 |
| Klickitat | $21,584 |
| Okanogan | $20,976 |
| Whitman | $20,379 |
| Grant | $20,324 |
| Yakima | $19,610 |
| Ferry | $19,320 |
| Franklin | $19,073 |
| Adams | $16,539 |
US-Places.com
Washington Income by County -
Average income
The graph below ranks each Washington County by Average income according to the 2012 census estimates.