12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Moorhead | 1 | 45,642 | 44,542 | 0.48% | 2,048 | 22.28 | City |
| Dilworth | 2 | 4,881 | 4,608 | 1.14% | 1,517 | 3.22 | City |
| Barnesville | 3 | 2,768 | 2,762 | 0.04% | 1,306 | 2.12 | City |
| Hawley | 4 | 2,313 | 2,237 | 0.65% | 940 | 2.46 | City |
| Glyndon | 5 | 1,392 | 1,306 | 1.24% | 880 | 1.58 | City |
| Sabin | 6 | 598 | 617 | -0.66% | 1,317 | 0.45 | City |
| Ulen | 7 | 473 | 478 | -0.21% | 443 | 1.07 | City |
| Hitterdal | 8 | 201 | 200 | 0% | 233 | 0.86 | City |
| Felton | 9 | 164 | 174 | -1.21% | 162 | 1.01 | City |
| Comstock | 10 | 99 | 99 | 0% | 429 | 0.23 | City |
| Georgetown | 11 | 85 | 89 | -1.16% | 83 | 1.02 | City |
| Baker | 12 | 59 | 41 | 7.27% | 58 | 1.01 | CDP |
Moorhead is the largest city in Clay County, with a population of 45,642.
Baker is the smallest city in Clay County.
There are 12 cities in Clay County, Minnesota.