40 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Moorhead | 1 | 46,021 | 44,544 | 0.65% | 2,065 | 22 | City |
| Dilworth | 2 | 4,862 | 4,606 | 1.06% | 1,511 | 3 | City |
| Barnesville | 3 | 2,765 | 2,762 | 0% | 1,304 | 2 | City |
| Hawley | 4 | 2,283 | 2,236 | 0.4% | 928 | 2 | City |
| Glyndon | 5 | 1,383 | 1,310 | 1.02% | 874 | 2 | City |
| Eglon | 6 | 709 | 709 | 0% | 21 | 34 | Township |
| Sabin | 7 | 597 | 617 | -0.67% | 1,315 | 0 | City |
| Parke | 8 | 530 | 529 | 0% | 16 | 34 | Township |
| Spring Prairie | 9 | 512 | 506 | 0.39% | 14 | 36 | Township |
| Oakport | 10 | 503 | 504 | -0.2% | 19 | 27 | Township |
| Hawley | 11 | 482 | 479 | 0% | 16 | 31 | Township |
| Ulen | 12 | 470 | 478 | -0.42% | 440 | 1 | City |
| Riverton | 13 | 438 | 435 | 0% | 12 | 36 | Township |
| Elmwood | 14 | 414 | 411 | 0% | 12 | 36 | Township |
| Glyndon | 15 | 317 | 313 | 0.32% | 9 | 34 | Township |
| Highland Grove | 16 | 272 | 269 | 0.37% | 8 | 34 | Township |
| Tansem | 17 | 271 | 269 | 0% | 8 | 36 | Township |
| Kragnes | 18 | 257 | 256 | 0.39% | 7 | 38 | Township |
| Kurtz | 19 | 256 | 254 | 0.39% | 8 | 32 | Township |
| Moland | 20 | 256 | 259 | -0.78% | 7 | 35 | Township |
| Alliance | 21 | 203 | 201 | 0.5% | 6 | 36 | Township |
| Hitterdal | 22 | 202 | 200 | 0% | 235 | 1 | City |
| Goose Prairie | 23 | 199 | 200 | -0.5% | 6 | 35 | Township |
| Moorhead | 24 | 185 | 186 | -0.54% | 16 | 12 | Township |
| Barnesville | 25 | 179 | 180 | -0.56% | 5 | 35 | Township |
| Skree | 26 | 179 | 176 | 0.56% | 5 | 34 | Township |
| Ulen | 27 | 173 | 173 | -1.14% | 5 | 35 | Township |
| Felton | 28 | 167 | 176 | -1.18% | 165 | 1 | City |
| Morken | 29 | 153 | 152 | 0.66% | 4 | 36 | Township |
| Keene | 30 | 152 | 152 | -0.65% | 5 | 32 | Township |
| Georgetown | 31 | 139 | 136 | 1.46% | 4 | 37 | Township |
| Hagen | 32 | 132 | 129 | 1.54% | 4 | 32 | Township |
| Comstock | 33 | 116 | 121 | -0.85% | 3 | 45 | Township |
| Holy Cross | 34 | 110 | 112 | -0.9% | 3 | 33 | Township |
| Comstock | 35 | 98 | 100 | -1.01% | 424 | 0 | City |
| Viding | 36 | 95 | 95 | 0% | 3 | 36 | Township |
| Flowing | 37 | 89 | 90 | -1.11% | 2 | 36 | Township |
| Georgetown | 38 | 86 | 89 | -1.15% | 84 | 1 | City |
| Felton | 39 | 82 | 82 | 0% | 2 | 35 | Township |
| Baker | 40 | 59 | 41 | 7.27% | 58 | 1 | CDP |
Moorhead is the largest city in Clay County, with a population of 46,021.
Baker is the smallest city in Clay County, with a population of 59.
There are 40 cities in Clay County, Minnesota.