The graph below ranks each Washington County by total residents according to the 2012 census estimates.
Washington total population by county
| County | Total Population |
| King |  2,007,574 |
| Pierce | 812,055 |
| Snohomish | 732,962 |
| Spokane | 475,957 |
| Clark | 437,871 |
| Thurston | 258,653 |
| Kitsap | 254,625 |
| Yakima | 246,421 |
| Whatcom | 204,932 |
| Benton | 182,383 |
| Skagit | 118,056 |
| Cowlitz | 101,827 |
| Grant | 91,526 |
| Franklin | 85,777 |
| Island | 79,279 |
| Lewis | 75,518 |
| Chelan | 73,613 |
| Clallam | 71,887 |
| Grays Harbor | 71,734 |
| Mason | 60,760 |
| Walla Walla | 59,400 |
| Whitman | 46,490 |
| Stevens | 43,605 |
| Kittitas | 41,650 |
| Okanogan | 41,247 |
| Douglas | 39,309 |
| Jefferson | 29,846 |
| Asotin | 21,877 |
| Klickitat | 20,629 |
| Pacific | 20,591 |
| Adams | 18,934 |
| San Juan | 15,791 |
| Pend Oreille | 12,966 |
| Skamania | 11,187 |
| Lincoln | 10,455 |
| Ferry | 7,706 |
| Columbia | 3,998 |
| Wahkiakum | 3,997 |
| Garfield | 2,230 |