19 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Geneva | 1 | 2,129 | 2,143 | -0.14% | 906 | 2.35 | City |
| Exeter-Fairmont Consolidated township | 2 | 1,299 | 1,287 | 0.78% | 18 | 71.54 | Township |
| Geneva township | 3 | 1,174 | 1,227 | -1.92% | 33 | 35.98 | Township |
| Fairmont | 4 | 586 | 595 | -0.34% | 509 | 1.15 | Village |
| Exeter | 5 | 518 | 523 | -0.19% | 818 | 0.63 | Village |
| Bryant township | 6 | 435 | 428 | 0.93% | 12 | 36.04 | Township |
| Shickley | 7 | 347 | 349 | 0% | 1,134 | 0.31 | Village |
| Glengary township | 8 | 345 | 343 | 0.58% | 10 | 36.07 | Township |
| Milligan | 9 | 247 | 249 | 0% | 957 | 0.26 | Village |
| Grafton township | 10 | 225 | 225 | 0% | 6 | 36.08 | Township |
| Ohiowa | 11 | 122 | 122 | 0% | 490 | 0.25 | Village |
| Belle Prairie township | 12 | 114 | 115 | 0% | 3 | 35.95 | Township |
| Grafton | 13 | 110 | 109 | 0% | 315 | 0.35 | Village |
| Chelsea township | 14 | 98 | 96 | 1.03% | 3 | 35.81 | Township |
| Hamilton township | 15 | 94 | 95 | 0% | 3 | 35.99 | Township |
| West Blue township | 16 | 72 | 70 | 1.41% | 2 | 35.93 | Township |
| Bennett township | 17 | 70 | 68 | 1.45% | 2 | 36.11 | Township |
| Momence township | 18 | 68 | 66 | 1.49% | 2 | 36.23 | Township |
| Strang | 19 | 32 | 32 | 0% | 258 | 0.12 | Village |
Geneva is the largest city in Fillmore County, with a population of 2,129.
Strang is the smallest city in Fillmore County.
There are 19 cities in Fillmore County, Nebraska.