37 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Chatfield | 1 | 3,028 | 3,003 | 0.17% | 1,170 | 3 | City |
| Spring Valley | 2 | 2,442 | 2,457 | -0.12% | 826 | 3 | City |
| Rushford | 3 | 1,849 | 1,863 | -0.16% | 1,121 | 2 | City |
| Preston | 4 | 1,315 | 1,319 | -0.08% | 533 | 2 | City |
| Harmony | 5 | 1,026 | 1,046 | -0.39% | 920 | 1 | City |
| Rushford Village | 6 | 800 | 795 | 0.13% | 24 | 34 | City |
| Lanesboro | 7 | 709 | 724 | -0.42% | 468 | 2 | City |
| Mabel | 8 | 702 | 717 | -0.43% | 1,459 | 0 | City |
| Canton | 9 | 676 | 654 | 0.15% | 19 | 35 | Township |
| Spring Valley | 10 | 560 | 543 | 0.18% | 18 | 32 | Township |
| Chatfield | 11 | 546 | 526 | 0.37% | 16 | 34 | Township |
| Fillmore | 12 | 503 | 485 | 0.2% | 14 | 35 | Township |
| Sumner | 13 | 501 | 487 | 0% | 13 | 38 | Township |
| Newburg | 14 | 450 | 434 | 0.45% | 13 | 35 | Township |
| Bristol | 15 | 435 | 418 | 0.46% | 12 | 36 | Township |
| Wykoff | 16 | 429 | 431 | -0.23% | 460 | 1 | City |
| Amherst | 17 | 427 | 409 | 0.47% | 12 | 36 | Township |
| Harmony | 18 | 406 | 387 | 0.74% | 12 | 35 | Township |
| Fountain | 19 | 405 | 408 | -0.25% | 407 | 1 | City |
| Carrolton | 20 | 388 | 372 | 0.78% | 10 | 38 | Township |
| Pilot Mound | 21 | 386 | 375 | 0% | 11 | 34 | Township |
| Preston | 22 | 386 | 370 | 0.78% | 11 | 35 | Township |
| Norway | 23 | 381 | 368 | 0% | 11 | 36 | Township |
| York | 24 | 380 | 365 | 0.53% | 11 | 36 | Township |
| Forestville | 25 | 377 | 365 | 0% | 10 | 36 | Township |
| Bloomfield | 26 | 336 | 324 | 0.3% | 9 | 36 | Township |
| Arendahl | 27 | 316 | 306 | 0% | 9 | 36 | Township |
| Fountain | 28 | 315 | 300 | 0.64% | 9 | 35 | Township |
| Canton | 29 | 313 | 312 | 0% | 304 | 1 | City |
| Carimona | 30 | 294 | 284 | 0% | 8 | 36 | Township |
| Holt | 31 | 243 | 236 | 0% | 7 | 32 | Township |
| Peterson | 32 | 225 | 232 | -0.88% | 474 | 0 | City |
| Ostrander | 33 | 224 | 231 | -0.88% | 472 | 0 | City |
| Beaver | 34 | 220 | 211 | 0.46% | 6 | 36 | Township |
| Preble | 35 | 215 | 208 | 0% | 6 | 36 | Township |
| High Forest | 36 | 165 | 118 | 7.14% | 506 | 0 | CDP |
| Whalan | 37 | 69 | 66 | 0% | 160 | 0 | City |
Chatfield is the largest city in Fillmore County, with a population of 3,028.
Whalan is the smallest city in Fillmore County, with a population of 69.
There are 37 cities in Fillmore County, Minnesota.