9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Springfield | 1 | 57,912 | 58,590 | -0.19% | 2,174 | 27 | City |
| New Carlisle | 2 | 5,487 | 5,559 | -0.22% | 2,046 | 3 | City |
| Enon | 3 | 2,439 | 2,466 | -0.16% | 1,885 | 1 | Village |
| South Charleston | 4 | 1,688 | 1,709 | -0.18% | 1,369 | 1 | Village |
| North Hampton | 5 | 449 | 457 | -0.22% | 1,166 | 0 | Village |
| South Vienna | 6 | 405 | 411 | -0.25% | 622 | 1 | Village |
| Tremont City | 7 | 343 | 352 | -0.29% | 1,552 | 0 | Village |
| Donnelsville | 8 | 255 | 260 | -0.39% | 802 | 0 | Village |
| Catawba | 9 | 240 | 245 | -0.41% | 1,039 | 0 | Village |
Springfield is the largest city in Clark County, with a population of 57,912.
Catawba is the smallest city in Clark County, with a population of 240.
There are 9 cities in Clark County, Ohio.