| City | Population |
| Adams, OR | 350 |
| Arlington, OR | 586 |
| Athena, OR | 1,126 |
| Boardman, OR | 3,220 |
| Cayuse, OR | 68 |
| Condon, OR | 682 |
| Echo, OR | 699 |
| Elgin, OR | 1,711 |
| Gilliam County rural, OR | 582 |
| Gopher Flats, OR | 379 |
| Hermiston, OR | 16,745 |
| Imbler, OR | 306 |
| Irrigon, OR | 1,826 |
| Kirkpatrick, OR | 179 |
| Mission, OR | 1,037 |
| Pendleton, OR | 16,612 |
| Pilot Rock, OR | 1,502 |
| Riverside, OR | 199 |
| Stanfield, OR | 2,043 |
| Summerville town, OR | 135 |
| Tutuilla, OR | 487 |
| Umatilla, OR | 6,906 |
| Umatilla County rural, OR | 19,155 |
| Weston, OR | 667 |
| Basin City, WA | 1,092 |
| Benton City, WA | 3,038 |
| Benton County rural, WA | 26,627 |
| Bickleton, WA | 88 |
| Burbank, WA | 3,291 |
| College Place, WA | 8,765 |
| Columbia County rural, WA | 1,423 |
| Connell, WA | 4,209 |
| Dayton, WA | 2,526 |
| Desert Aire, WA | 1,626 |
| Dixie, WA | 197 |
| Finley, WA | 6,012 |
| Franklin County rural, WA | 8,660 |
| Garrett, WA | 1,419 |
| Hatton town, WA | 101 |
| Kahlotus, WA | 193 |
| Kennewick, WA | 73,917 |
| Mattawa town, WA | 4,437 |
| Mesa, WA | 489 |
| Othello, WA | 7,364 |
| Pasco, WA | 59,781 |
| Prescott, WA | 318 |
| Richland, WA | 48,058 |
| Roosevelt, WA | 156 |
| Royal City, WA | 2,140 |
| Touchet, WA | 421 |
| Waitsburg, WA | 1,217 |
| Walla Walla, WA | 31,731 |
| Walla Walla County rural, WA | 9,571 |
| Walla Walla East, WA | 1,672 |
| Wallula, WA | 179 |
| Warden, WA | 2,692 |
| Washtucna town, WA | 208 |
| West Pasco, WA | 3,739 |
| West Richland, WA | 11,811 |
| | |
| Total | 406,370 |
