25 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| DeWitt charter | 1 | 15,400 | 15,121 | 0.01% | 548 | 28 | Township |
| Bath charter | 2 | 13,598 | 13,307 | 0.57% | 413 | 33 | Township |
| St. Johns | 3 | 7,729 | 7,699 | 0.08% | 1,835 | 4 | City |
| Watertown charter | 4 | 5,872 | 5,570 | 1.05% | 165 | 36 | Township |
| DeWitt | 5 | 4,781 | 4,775 | 0.02% | 1,685 | 3 | City |
| Eureka | 6 | 4,417 | 4,213 | 1.1% | 154 | 29 | Township |
| Victor | 7 | 3,484 | 3,462 | 0.26% | 103 | 34 | Township |
| Bingham | 8 | 2,962 | 2,914 | 0.44% | 92 | 32 | Township |
| Eagle | 9 | 2,799 | 2,775 | 0.25% | 81 | 35 | Township |
| Olive | 10 | 2,549 | 2,536 | 0.2% | 72 | 36 | Township |
| Westphalia | 11 | 2,445 | 2,438 | 0.12% | 69 | 36 | Township |
| Dallas | 12 | 2,426 | 2,412 | 0.25% | 67 | 36 | Township |
| Duplain | 13 | 2,313 | 2,303 | 0.17% | 66 | 35 | Township |
| Ovid | 14 | 2,239 | 2,167 | 1.45% | 67 | 33 | Township |
| Ovid | 15 | 2,203 | 2,189 | 0.14% | 63 | 35 | Township |
| Riley | 16 | 2,027 | 2,012 | 0.3% | 57 | 36 | Township |
| Essex | 17 | 1,841 | 1,831 | 0.16% | 52 | 35 | Township |
| Ovid | 18 | 1,490 | 1,482 | 0.07% | 1,475 | 1 | City |
| Fowler | 19 | 1,234 | 1,233 | 0% | 962 | 1 | Village |
| Bengal | 20 | 1,135 | 1,132 | 0.18% | 31 | 37 | Township |
| Elsie | 21 | 948 | 943 | 0.11% | 830 | 1 | Village |
| Westphalia | 22 | 944 | 939 | 0.11% | 847 | 1 | Village |
| Lebanon | 23 | 598 | 595 | 0.34% | 17 | 35 | Township |
| Maple Rapids | 24 | 584 | 579 | 0.17% | 428 | 1 | Village |
| Eagle | 25 | 104 | 103 | 0% | 832 | 0 | Village |
DeWitt charter is the largest city in Clinton County, with a population of 15,400.
Eagle is the smallest city in Clinton County, with a population of 104.
There are 25 cities in Clinton County, Michigan.