8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Garner | 1 | 3,046 | 3,055 | -0.03% | 1,433 | 2 | City |
| Britt | 2 | 1,983 | 2,037 | -0.45% | 1,480 | 1 | City |
| Kanawha | 3 | 631 | 652 | -0.47% | 318 | 2 | City |
| Klemme | 4 | 424 | 439 | -0.47% | 848 | 1 | City |
| Corwith | 5 | 256 | 265 | -0.39% | 177 | 1 | City |
| Crystal Lake | 6 | 238 | 253 | -0.83% | 960 | 0 | City |
| Woden | 7 | 181 | 187 | -0.55% | 367 | 0 | City |
| Goodell | 8 | 137 | 142 | -0.72% | 317 | 0 | City |
Garner is the largest city in Hancock County, with a population of 3,046.
Goodell is the smallest city in Hancock County, with a population of 137.
There are 8 cities in Hancock County, Iowa.