7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Hampton | 1 | 3,419 | 3,489 | -0.41% | 1,020 | 3 | City |
| Nashua | 2 | 1,506 | 1,551 | -0.59% | 515 | 3 | City |
| Fredericksburg | 3 | 982 | 987 | -0.1% | 1,091 | 1 | City |
| Lawler | 4 | 389 | 403 | -0.77% | 407 | 1 | City |
| Ionia | 5 | 218 | 228 | -0.91% | 387 | 1 | City |
| Alta Vista | 6 | 217 | 227 | -0.91% | 289 | 1 | City |
| North Washington | 7 | 106 | 110 | -0.93% | 522 | 0 | City |
New Hampton is the largest city in Chickasaw County, with a population of 3,419.
North Washington is the smallest city in Chickasaw County, with a population of 106.
There are 7 cities in Chickasaw County, Iowa.