| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| DeWitt | 1 | 15,603 | 15,117 | 0.56% | 555 | 28 | Township |
| Bath | 2 | 13,595 | 13,301 | 0.29% | 413 | 33 | Township |
| St. Johns | 3 | 7,791 | 7,724 | 0.14% | 1,849 | 4 | City |
| Watertown | 4 | 5,961 | 5,569 | 1.21% | 168 | 36 | Township |
| DeWitt | 5 | 4,798 | 4,782 | 0.06% | 1,691 | 3 | City |
| Eureka | 6 | 4,359 | 4,203 | 0.11% | 152 | 29 | Township |
| Victor | 7 | 3,500 | 3,465 | 0.2% | 103 | 34 | Township |
| Bingham | 8 | 2,983 | 2,921 | 0.34% | 93 | 32 | Township |
| Eagle | 9 | 2,806 | 2,774 | 0.14% | 81 | 35 | Township |
| Olive | 10 | 2,529 | 2,512 | 0.08% | 71 | 36 | Township |
| Westphalia | 11 | 2,453 | 2,437 | 0.08% | 69 | 36 | Township |
| Dallas | 12 | 2,419 | 2,412 | -0.04% | 66 | 36 | Township |
| Duplain | 13 | 2,319 | 2,301 | 0.13% | 66 | 35 | Township |
| Ovid | 14 | 2,219 | 2,184 | 0.09% | 67 | 33 | Township |
| Ovid | 15 | 2,211 | 2,189 | 0.14% | 63 | 35 | Township |
| Riley | 16 | 2,031 | 2,011 | 0.15% | 57 | 36 | Township |
| Essex | 17 | 1,850 | 1,834 | 0.16% | 52 | 35 | Township |
| Ovid | 18 | 1,500 | 1,483 | 0.13% | 1,485 | 1 | City |
| Fowler | 19 | 1,237 | 1,233 | 0% | 964 | 1 | Village |
| Bengal | 20 | 1,136 | 1,132 | 0.09% | 31 | 37 | Township |
| Elsie | 21 | 952 | 943 | 0.21% | 834 | 1 | Village |
| Westphalia | 22 | 948 | 940 | 0.11% | 851 | 1 | Village |
| Lebanon | 23 | 595 | 595 | -0.17% | 17 | 35 | Township |
| Maple Rapids | 24 | 589 | 581 | 0.17% | 431 | 1 | Village |
| Eagle | 25 | 107 | 106 | 0% | 856 | 0 | Village |
DeWitt is the largest city in Clinton County, with a population of 15,603.
Eagle is the smallest city in Clinton County, with a population of 107.
There are 25 cities in Clinton County, Michigan.