8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Sidney | 1 | 1,039 | 1,065 | -0.38% | 758 | 1 | City |
| Tabor | 2 | 972 | 1,005 | -0.51% | 752 | 1 | City |
| Hamburg | 3 | 854 | 881 | -0.47% | 570 | 1 | City |
| Farragut | 4 | 477 | 486 | -0.21% | 1,190 | 0 | City |
| Riverton | 5 | 240 | 248 | -0.41% | 398 | 1 | City |
| Randolph | 6 | 180 | 189 | -0.55% | 600 | 0 | City |
| Thurman | 7 | 161 | 163 | 0% | 285 | 1 | City |
| Imogene | 8 | 36 | 38 | 0% | 73 | 0 | City |
Sidney is the largest city in Fremont County, with a population of 1,039.
Imogene is the smallest city in Fremont County, with a population of 36.
There are 8 cities in Fremont County, Iowa.