| County Population Centroids for Washington |
| ST | COU | COUNTY NAME | POPULATION | LATITUDE | LONGITUDE |
| 53 | 001 | Adams | 16,428 | 46.874469 | -118.98781 |
| 53 | 003 | Asotin | 20,551 | 46.388422 | -117.06685 |
| 53 | 005 | Benton | 142,475 | 46.230750 | -119.27613 |
| 53 | 007 | Chelan | 66,616 | 47.532540 | -120.34824 |
| 53 | 009 | Clallam | 64,525 | 48.094628 | -123.48804 |
| 53 | 011 | Clark | 345,238 | 45.677786 | -122.56631 |
| 53 | 013 | Columbia | 4,064 | 46.326840 | -117.98037 |
| 53 | 015 | Cowlitz | 92,948 | 46.143103 | -122.90676 |
| 53 | 017 | Douglas | 32,603 | 47.516556 | -120.16212 |
| 53 | 019 | Ferry | 7,260 | 48.625332 | -118.53121 |
| 53 | 021 | Franklin | 49,347 | 46.316144 | -119.10072 |
| 53 | 023 | Garfield | 2,397 | 46.478111 | -117.57575 |
| 53 | 025 | Grant | 74,698 | 47.156264 | -119.45854 |
| 53 | 027 | Grays Harbor | 67,194 | 46.995579 | -123.76312 |
| 53 | 029 | Island | 71,558 | 48.208148 | -122.57726 |
| 53 | 031 | Jefferson | 25,953 | 48.010374 | -122.82332 |
| 53 | 033 | King | 1737034 | 47.549353 | -122.23638 |
| 53 | 035 | Kitsap | 231,969 | 47.612380 | -122.63373 |
| 53 | 037 | Kittitas | 33,362 | 47.047952 | -120.62719 |
| 53 | 039 | Klickitat | 19,161 | 45.794801 | -121.11047 |
| 53 | 041 | Lewis | 68,600 | 46.617899 | -122.81924 |
| 53 | 043 | Lincoln | 10,184 | 47.617302 | -118.33792 |
| 53 | 045 | Mason | 49,405 | 47.282793 | -123.04611 |
| 53 | 047 | Okanogan | 39,564 | 48.442796 | -119.57417 |
| 53 | 049 | Pacific | 20,984 | 46.533906 | -123.89430 |
| 53 | 051 | Pend Oreille | 11,732 | 48.291976 | -117.22485 |
| 53 | 053 | Pierce | 700,820 | 47.183191 | -122.42003 |
| 53 | 055 | San Juan | 14,077 | 48.572257 | -122.97811 |
| 53 | 057 | Skagit | 102,979 | 48.467639 | -122.33642 |
| 53 | 059 | Skamania | 9,872 | 45.695401 | -121.91627 |
| 53 | 061 | Snohomish | 606,024 | 47.927183 | -122.19267 |
| 53 | 063 | Spokane | 417,939 | 47.679974 | -117.37348 |
| 53 | 065 | Stevens | 40,066 | 48.302546 | -117.82109 |
| 53 | 067 | Thurston | 207,355 | 47.002534 | -122.84788 |
| 53 | 069 | Wahkiakum | 3,824 | 46.237889 | -123.43300 |
| 53 | 071 | Walla Walla | 55,180 | 46.081746 | -118.39309 |
| 53 | 073 | Whatcom | 166,814 | 48.818831 | -122.48336 |
| 53 | 075 | Whitman | 40,740 | 46.810063 | -117.23552 |
| 53 | 077 | Yakima | 222,581 | 46.517070 | -120.42118 |