8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Charles City | 1 | 6,931 | 7,381 | -1.07% | 1,132 | 6 | City |
| Nora Springs | 2 | 1,313 | 1,364 | -0.61% | 593 | 2 | City |
| Rockford | 3 | 703 | 760 | -1.26% | 1,128 | 1 | City |
| Rudd | 4 | 331 | 355 | -1.19% | 304 | 1 | City |
| Floyd | 5 | 291 | 309 | -1.02% | 527 | 1 | City |
| Marble Rock | 6 | 252 | 269 | -1.18% | 303 | 1 | City |
| Mitchell | 7 | 116 | 122 | -0.85% | 206 | 1 | City |
| Colwell | 8 | 51 | 54 | 0% | 309 | 0 | City |
Charles City is the largest city in Floyd County, with a population of 6,931.
Colwell is the smallest city in Floyd County, with a population of 51.
There are 8 cities in Floyd County, Iowa.