| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Springfield | 1 | 58,289 | 58,581 | 0.01% | 2,188 | 27 | City |
| New Carlisle | 2 | 5,526 | 5,559 | 0.02% | 2,060 | 3 | City |
| Enon | 3 | 2,457 | 2,465 | 0.04% | 1,899 | 1 | Village |
| South Charleston | 4 | 1,698 | 1,707 | 0% | 1,377 | 1 | Village |
| North Hampton | 5 | 461 | 466 | 0% | 1,197 | 0 | Village |
| South Vienna | 6 | 404 | 409 | -0.25% | 621 | 1 | Village |
| Tremont City | 7 | 345 | 352 | -0.29% | 1,561 | 0 | Village |
| Donnelsville | 8 | 256 | 260 | -0.39% | 805 | 0 | Village |
| Catawba | 9 | 244 | 244 | 0% | 1,056 | 0 | Village |
Springfield is the largest city in Clark County, with a population of 58,289.
Catawba is the smallest city in Clark County, with a population of 244.
There are 9 cities in Clark County, Ohio.