12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clinton | 1 | 24,036 | 24,446 | -0.34% | 675 | 36 | City |
| DeWitt | 2 | 5,645 | 5,517 | 0.44% | 907 | 6 | City |
| Camanche | 3 | 4,528 | 4,568 | -0.18% | 510 | 9 | City |
| Wheatland | 4 | 762 | 777 | -0.39% | 1,328 | 1 | City |
| Grand Mound | 5 | 605 | 619 | -0.49% | 323 | 2 | City |
| Delmar | 6 | 540 | 544 | -0.18% | 707 | 1 | City |
| Lost Nation | 7 | 423 | 431 | -0.47% | 560 | 1 | City |
| Charlotte | 8 | 385 | 389 | -0.26% | 674 | 1 | City |
| Calamus | 9 | 346 | 354 | -0.57% | 702 | 0 | City |
| Goose Lake | 10 | 250 | 249 | 0% | 755 | 0 | City |
| Low Moor | 11 | 240 | 248 | -0.83% | 440 | 1 | City |
| Andover | 12 | 105 | 108 | -0.94% | 587 | 0 | City |
Clinton is the largest city in Clinton County, with a population of 24,036.
Andover is the smallest city in Clinton County, with a population of 105.
There are 12 cities in Clinton County, Iowa.