9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Charles City | 1 | 7,125 | 7,382 | -0.71% | 1,163 | 6.12 | City |
| Nora Springs | 2 | 1,337 | 1,364 | -0.37% | 603 | 2.22 | City |
| Rockford | 3 | 727 | 762 | -0.95% | 1,167 | 0.62 | City |
| Rudd | 4 | 342 | 357 | -0.87% | 314 | 1.09 | City |
| Floyd | 5 | 301 | 311 | -0.66% | 545 | 0.55 | City |
| Marble Rock | 6 | 258 | 268 | -0.77% | 310 | 0.83 | City |
| Mitchell | 7 | 114 | 123 | -1.72% | 202 | 0.56 | City |
| New Haven | 8 | 72 | 103 | 5.88% | 37 | 1.93 | CDP |
| Colwell | 9 | 56 | 58 | 0% | 339 | 0.17 | City |
Charles City is the largest city in Floyd County, with a population of 7,125.
Colwell is the smallest city in Floyd County.
There are 9 cities in Floyd County, Iowa.