12 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clinton | 1 | 23,954 | 24,446 | -0.34% | 673 | 36 | City |
| DeWitt | 2 | 5,671 | 5,517 | 0.46% | 911 | 6 | City |
| Camanche | 3 | 4,520 | 4,568 | -0.18% | 509 | 9 | City |
| Wheatland | 4 | 759 | 777 | -0.39% | 1,322 | 1 | City |
| Grand Mound | 5 | 602 | 619 | -0.5% | 322 | 2 | City |
| Delmar | 6 | 539 | 544 | -0.19% | 705 | 1 | City |
| Lost Nation | 7 | 422 | 431 | -0.24% | 558 | 1 | City |
| Charlotte | 8 | 384 | 389 | -0.26% | 673 | 1 | City |
| Calamus | 9 | 345 | 354 | -0.29% | 700 | 0 | City |
| Goose Lake | 10 | 250 | 249 | 0% | 755 | 0 | City |
| Low Moor | 11 | 239 | 248 | -0.42% | 439 | 1 | City |
| Andover | 12 | 105 | 108 | 0% | 587 | 0 | City |
Clinton is the largest city in Clinton County, with a population of 23,954.
Andover is the smallest city in Clinton County, with a population of 105.
There are 12 cities in Clinton County, Iowa.