| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Garner | 1 | 3,027 | 3,055 | -0.07% | 1,424 | 2 | City |
| Britt | 2 | 1,972 | 2,038 | -0.45% | 1,472 | 1 | City |
| Kanawha | 3 | 625 | 654 | -0.79% | 315 | 2 | City |
| Klemme | 4 | 421 | 439 | -0.71% | 842 | 1 | City |
| Corwith | 5 | 251 | 264 | -0.79% | 173 | 1 | City |
| Crystal Lake | 6 | 237 | 254 | -1.25% | 956 | 0 | City |
| Woden | 7 | 183 | 192 | -1.08% | 371 | 0 | City |
| Goodell | 8 | 137 | 141 | -0.72% | 317 | 0 | City |
Garner is the largest city in Hancock County, with a population of 3,027.
Goodell is the smallest city in Hancock County, with a population of 137.
There are 8 cities in Hancock County, Iowa.