Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Moses Lake | 1 | 26,616 | 25,348 | 1.21% | 1,468 | 18.1 | City |
| Ephrata | 2 | 8,721 | 8,496 | 0.65% | 832 | 10.5 | City |
| Quincy | 3 | 8,542 | 7,632 | 2.73% | 1,363 | 6.3 | City |
| Moses Lake North | 4 | 5,048 | 4,664 | 0.9% | 882 | 5.7 | CDP |
| Mattawa | 5 | 3,900 | 3,342 | 3.7% | 3,896 | 1.0 | City |
| Cascade Valley | 6 | 3,659 | 3,234 | 2.84% | 985 | 3.7 | CDP |
| Desert Aire | 7 | 2,895 | 2,716 | 3.21% | 852 | 3.4 | CDP |
| Warden | 8 | 2,738 | 2,454 | 2.66% | 934 | 2.9 | City |
| Royal City | 9 | 1,934 | 1,785 | 1.95% | 1,662 | 1.2 | City |
| Soap Lake | 10 | 1,758 | 1,700 | 0.8% | 1,144 | 1.5 | City |
| Lakeview | 11 | 1,644 | 1,013 | 3.27% | 1,460 | 1.1 | CDP |
| Grand Coulee | 12 | 952 | 975 | -0.63% | 758 | 1.3 | City |
| Electric City | 13 | 942 | 958 | -0.42% | 474 | 2.0 | City |
| George | 14 | 910 | 808 | 2.83% | 660 | 1.4 | City |
| Coulee City | 15 | 551 | 550 | 0% | 596 | 0.9 | Town |
| Schwana | 16 | 410 | 669 | 7.9% | 1,633 | 0.3 | CDP |
| Beverly | 17 | 359 | 0 | 7.49% | 1,910 | 0.2 | CDP |
| Wheeler | 18 | 275 | 0 | 7.42% | 1,244 | 0.2 | CDP |
| Wilson Creek | 19 | 201 | 205 | -0.5% | 208 | 1.0 | Town |
| Hartline | 20 | 176 | 179 | -0.56% | 527 | 0.3 | Town |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Moses Lake is the largest city in Grant County.
Hartline is the smallest city in Grant County.
There are 20 cities in Grant County, Washington.