| County | Mixed Race Percentage of Total Population |
| Pierce |  7 |
| Kitsap | 6 |
| Thurston | 5 |
| Ferry | 5 |
| King | 5 |
| Island | 4 |
| Snohomish | 4 |
| Clark | 4 |
| Mason | 4 |
| Whitman | 4 |
| Clallam | 4 |
| Spokane | 4 |
| Pacific | 4 |
| Grays Harbor | 4 |
| Whatcom | 4 |
| Jefferson | 3 |
| Cowlitz | 3 |
| Stevens | 3 |
| Skamania | 3 |
| Lewis | 3 |
| Okanogan | 3 |
| Skagit | 3 |
| Kittitas | 3 |
| Klickitat | 3 |
| Wahkiakum | 3 |
| Pend Oreille | 3 |
| Yakima | 3 |
| Benton | 3 |
| Lincoln | 3 |
| Walla Walla | 2 |
| San Juan | 2 |
| Franklin | 2 |
| Asotin | 2 |
| Douglas | 2 |
| Grant | 2 |
| Columbia | 2 |
| Chelan | 2 |
| Garfield | 2 |
| Adams | 1 |