| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Charles City | 1 | 6,946 | 7,380 | -0.96% | 1,134 | 6 | City |
| Nora Springs | 2 | 1,308 | 1,365 | -0.61% | 590 | 2 | City |
| Rockford | 3 | 706 | 759 | -1.26% | 1,133 | 1 | City |
| Rudd | 4 | 332 | 357 | -1.19% | 305 | 1 | City |
| Floyd | 5 | 291 | 309 | -1.02% | 527 | 1 | City |
| Marble Rock | 6 | 252 | 269 | -1.18% | 303 | 1 | City |
| Mitchell | 7 | 114 | 123 | -1.72% | 202 | 1 | City |
| Colwell | 8 | 52 | 56 | -1.89% | 315 | 0 | City |
Charles City is the largest city in Floyd County, with a population of 6,946.
Colwell is the smallest city in Floyd County, with a population of 52.
There are 8 cities in Floyd County, Iowa.