7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Hampton | 1 | 3,376 | 3,491 | -0.68% | 1,007 | 3.35 | City |
| Nashua | 2 | 1,472 | 1,549 | -1.01% | 504 | 2.92 | City |
| Fredericksburg | 3 | 969 | 986 | -0.31% | 1,077 | 0.90 | City |
| Lawler | 4 | 384 | 408 | -1.29% | 402 | 0.95 | City |
| Ionia | 5 | 213 | 228 | -1.39% | 378 | 0.56 | City |
| Alta Vista | 6 | 211 | 226 | -1.4% | 281 | 0.75 | City |
| North Washington | 7 | 105 | 112 | -0.94% | 517 | 0.20 | City |
New Hampton is the largest city in Chickasaw County, with a population of 3,376.
North Washington is the smallest city in Chickasaw County.
There are 7 cities in Chickasaw County, Iowa.