20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fergus Falls | 1 | 14,276 | 14,121 | 0.22% | 992 | 14.39 | City |
| Perham | 2 | 3,767 | 3,514 | 1.37% | 1,053 | 3.58 | City |
| Pelican Rapids | 3 | 2,600 | 2,592 | 0.08% | 1,007 | 2.58 | City |
| New York Mills | 4 | 1,356 | 1,353 | 0.07% | 914 | 1.48 | City |
| Parkers Prairie | 5 | 1,033 | 1,020 | 0.29% | 830 | 1.25 | City |
| Battle Lake | 6 | 945 | 859 | 1.83% | 658 | 1.44 | City |
| Henning | 7 | 860 | 857 | 0.12% | 260 | 3.30 | City |
| Ottertail | 8 | 755 | 639 | 3.14% | 177 | 4.28 | City |
| Underwood | 9 | 366 | 358 | 0.55% | 624 | 0.59 | City |
| Vergas | 10 | 359 | 346 | 0.84% | 229 | 1.57 | City |
| Deer Creek | 11 | 332 | 332 | 0% | 83 | 4.01 | City |
| Dalton | 12 | 216 | 216 | 0% | 911 | 0.24 | City |
| Bluffton | 13 | 212 | 212 | 0% | 78 | 2.73 | City |
| Dent | 14 | 170 | 170 | 0% | 470 | 0.36 | City |
| Elizabeth | 15 | 167 | 167 | 0% | 448 | 0.37 | City |
| Erhard | 16 | 131 | 131 | 0% | 237 | 0.55 | City |
| Richville | 17 | 78 | 77 | 0% | 79 | 0.99 | City |
| Clitherall | 18 | 71 | 63 | 2.9% | 372 | 0.19 | City |
| Vining | 19 | 59 | 59 | 0% | 51 | 1.15 | City |
| Doran | 20 | 33 | 35 | 0% | 159 | 0.21 | City |
Fergus Falls is the largest city in Otter Tail County, with a population of 14,276.
Doran is the smallest city in Otter Tail County.
There are 20 cities in Otter Tail County, Minnesota.