| population | |
| Adams County | 18728 |
| Asotin County | 21623 |
| Benton County | 175177 |
| Chelan County | 79646 |
| Clallam County | 71404 |
| Clark County | 425363 |
| Columbia County | 4078 |
| Cowlitz County | 102410 |
| Douglas County | 43696 |
| Ferry County | 7551 |
| Franklin County | 78163 |
| Garfield County | 2266 |
| Grant County | 100297 |
| population | |
| Grays Harbor County | 72797 |
| Island County | 78506 |
| Jefferson County | 33605 |
| King County | 1931249 |
| Kitsap County | 251133 |
| Kittitas County | 45499 |
| Klickitat County | 20318 |
| Lewis County | 75455 |
| Lincoln County | 10570 |
| Mason County | 60699 |
| Okanogan County | 42634 |
| Pacific County | 20920 |
| Pend Oreille County | 13001 |
| population | |
| Pierce County | 795225 |
| San Juan County | 15769 |
| Skagit County | 116901 |
| Skamania County | 11066 |
| Snohomish County | 713335 |
| Spokane County | 471221 |
| Stevens County | 43531 |
| Thurston County | 252264 |
| Wahkiakum County | 3978 |
| Walla Walla County | 58781 |
| Whatcom County | 201140 |
| Whitman County | 44776 |
| Yakima County | 256035 |
 | Pangborn Memorial Airport | ~ 24.84 km |
| Bowers Field | ~ 51.99 km |
| Easton State Airport | ~ 58.35 km |
| Ephrata Municipal Airport | ~ 77.19 km |
| Grant County International Airport | ~ 94.75 km |
| Yakima Air Terminal McAllister Field | ~ 103.67 km |
| Grand Coulee Dam Airport | ~ 116.03 km |
| Renton Municipal Airport | ~ 128.81 km |
| Omak Airport | ~ 129.82 km |
