7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Hampton | 1 | 3,405 | 3,489 | -0.41% | 1,016 | 3 | City |
| Nashua | 2 | 1,497 | 1,551 | -0.6% | 512 | 3 | City |
| Fredericksburg | 3 | 981 | 987 | -0.1% | 1,090 | 1 | City |
| Lawler | 4 | 386 | 403 | -0.77% | 404 | 1 | City |
| Ionia | 5 | 216 | 228 | -0.92% | 383 | 1 | City |
| Alta Vista | 6 | 215 | 227 | -0.92% | 286 | 1 | City |
| North Washington | 7 | 105 | 110 | -0.94% | 517 | 0 | City |
New Hampton is the largest city in Chickasaw County, with a population of 3,405.
North Washington is the smallest city in Chickasaw County, with a population of 105.
There are 7 cities in Chickasaw County, Iowa.