15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Chatfield | 1 | 2,988 | 3,000 | -0.07% | 1,154 | 2.59 | City |
| Spring Valley | 2 | 2,460 | 2,457 | 0.04% | 832 | 2.96 | City |
| Rushford | 3 | 1,860 | 1,862 | 0% | 1,127 | 1.65 | City |
| Preston | 4 | 1,327 | 1,319 | 0.15% | 538 | 2.46 | City |
| Harmony | 5 | 1,036 | 1,050 | -0.29% | 929 | 1.11 | City |
| Rushford Village | 6 | 809 | 794 | 0.37% | 24 | 33.51 | City |
| Lanesboro | 7 | 716 | 726 | -0.28% | 473 | 1.51 | City |
| Mabel | 8 | 706 | 720 | -0.42% | 1,468 | 0.48 | City |
| Wykoff | 9 | 431 | 431 | 0% | 462 | 0.93 | City |
| Fountain | 10 | 408 | 408 | 0% | 410 | 0.99 | City |
| Canton | 11 | 316 | 311 | 0.32% | 306 | 1.03 | City |
| Peterson | 12 | 225 | 232 | -0.44% | 474 | 0.47 | City |
| Ostrander | 13 | 222 | 229 | -0.45% | 467 | 0.47 | City |
| High Forest | 14 | 165 | 118 | 7.14% | 506 | 0.33 | CDP |
| Whalan | 15 | 72 | 66 | 1.41% | 167 | 0.43 | City |
Chatfield is the largest city in Fillmore County, with a population of 2,988.
Whalan is the smallest city in Fillmore County.
There are 15 cities in Fillmore County, Minnesota.