| State | County | Pop. | Density | Voted | % Dem. | % Rep. | Win |
|---|---|---|---|---|---|---|---|
| Washington | kitsap county | 271473 | 265.289 | 157625 | 0.572733% | 0.390566% | Democrat |
| Washington | kittitas county | 47935 | 8.05633 | 26198 | 0.435949% | 0.5384% | Republican |
| Washington | klickitat county | 22425 | 4.62608 | 13481 | 0.44203% | 0.53683% | Republican |
| Washington | lewis county | 80707 | 12.9688 | 45077 | 0.322115% | 0.652018% | Republican |
| Washington | lincoln county | 10939 | 1.82796 | 6993 | 0.244959% | 0.736451% | Republican |
| Washington | mason county | 66768 | 26.8705 | 37112 | 0.465321% | 0.50415% | Republican |
| Washington | okanogan county | 42243 | 3.09715 | 21152 | 0.420764% | 0.559758% | Republican |
| Washington | pacific county | 22471 | 9.30141 | 14017 | 0.484697% | 0.496041% | Republican |
| Washington | pend oreille county | 13724 | 3.78423 | 8513 | 0.304593% | 0.672853% | Republican |
| Washington | pierce county | 904980 | 209.464 | 460714 | 0.541564% | 0.429182% | Democrat |
| Washington | san juan county | 17582 | 39.0339 | 13090 | 0.742934% | 0.233537% | Democrat |
| Washington | skagit county | 129205 | 28.8337 | 72937 | 0.524453% | 0.449182% | Democrat |
| Washington | skamania county | 12083 | 2.81335 | 7268 | 0.439185% | 0.534535% | Republican |
| Washington | snohomish county | 822083 | 152.123 | 435582 | 0.589391% | 0.382082% | Democrat |
| Washington | spokane county | 522798 | 114.436 | 293294 | 0.462897% | 0.506577% | Republican |