7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Forest City | 1 | 4,276 | 4,266 | 0.05% | 932 | 4.59 | City |
| Lake Mills | 2 | 2,099 | 2,138 | -0.38% | 773 | 2.71 | City |
| Buffalo Center | 3 | 837 | 861 | -0.59% | 782 | 1.07 | City |
| Thompson | 4 | 483 | 498 | -0.62% | 564 | 0.86 | City |
| Leland | 5 | 241 | 250 | -0.82% | 180 | 1.34 | City |
| Rake | 6 | 179 | 186 | -0.56% | 237 | 0.76 | City |
| Scarville | 7 | 77 | 79 | 0% | 316 | 0.24 | City |
Forest City is the largest city in Winnebago County, with a population of 4,276.
Scarville is the smallest city in Winnebago County.
There are 7 cities in Winnebago County, Iowa.