34 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Springfield | 1 | 57,738 | 58,598 | -0.3% | 2,167 | 26.64 | City |
| Springfield township | 2 | 35,396 | 35,772 | 0.04% | 2,173 | 16.29 | Township |
| Springfield township | 3 | 26,959 | 27,009 | -0.07% | 1,252 | 21.52 | Township |
| Springfield township | 4 | 14,192 | 14,161 | 0.3% | 971 | 14.62 | Township |
| Moorefield township | 5 | 12,442 | 12,616 | -0.19% | 416 | 29.89 | Township |
| Springfield township | 6 | 12,127 | 12,325 | -0.23% | 400 | 30.32 | Township |
| Springfield township | 7 | 11,051 | 11,093 | -0.12% | 302 | 36.62 | Township |
| Mad River township | 8 | 10,844 | 10,992 | -0.18% | 327 | 33.13 | Township |
| German township | 9 | 7,522 | 7,578 | -0.04% | 228 | 33.06 | Township |
| Springfield township | 10 | 6,712 | 6,777 | -0.07% | 201 | 33.33 | Township |
| Springfield township | 11 | 5,523 | 5,482 | 0.38% | 298 | 18.55 | Township |
| New Carlisle | 12 | 5,450 | 5,559 | -0.4% | 2,032 | 2.68 | City |
| Park Layne | 13 | 3,882 | 4,420 | -0.77% | 2,652 | 1.46 | CDP |
| Pike township | 14 | 3,699 | 3,738 | -0.11% | 100 | 37.12 | Township |
| Harmony township | 15 | 3,594 | 3,634 | -0.11% | 71 | 50.70 | Township |
| Springfield township | 16 | 3,418 | 3,453 | -0.12% | 93 | 36.70 | Township |
| Pleasant township | 17 | 3,098 | 3,125 | -0.06% | 75 | 41.51 | Township |
| Springfield township | 18 | 2,989 | 3,033 | -0.17% | 83 | 36.20 | Township |
| Springfield township | 19 | 2,579 | 2,606 | -0.12% | 85 | 30.43 | Township |
| Enon | 20 | 2,419 | 2,463 | -0.37% | 1,869 | 1.29 | Village |
| Choctaw Lake | 21 | 2,339 | 2,099 | 2.32% | 2,256 | 1.04 | CDP |
| Green Meadows | 22 | 2,157 | 2,060 | -0.51% | 2,713 | 0.80 | CDP |
| Springfield township | 23 | 1,942 | 2,005 | -0.51% | 63 | 30.69 | Township |
| South Charleston | 24 | 1,675 | 1,709 | -0.42% | 1,358 | 1.23 | Village |
| Crystal Lakes | 25 | 1,636 | 1,478 | 0.68% | 3,401 | 0.48 | CDP |
| Holiday Valley | 26 | 1,516 | 1,573 | 0% | 833 | 1.82 | CDP |
| Wright-Patterson AFB | 27 | 1,487 | 2,414 | -1.52% | 151 | 9.87 | CDP |
| Medway | 28 | 668 | 360 | 7.22% | 1,400 | 0.48 | CDP |
| North Hampton | 29 | 450 | 462 | -0.44% | 1,169 | 0.39 | Village |
| South Vienna | 30 | 397 | 407 | -0.5% | 610 | 0.65 | Village |
| Tremont City | 31 | 341 | 353 | -0.58% | 1,543 | 0.22 | Village |
| Plumwood | 32 | 268 | 240 | -1.11% | 431 | 0.62 | CDP |
| Donnelsville | 33 | 252 | 259 | -0.4% | 792 | 0.32 | Village |
| Catawba | 34 | 239 | 244 | -0.42% | 1,035 | 0.23 | Village |
Springfield is the largest city in Clark County, with a population of 57,738.
Catawba is the smallest city in Clark County.
There are 34 cities in Clark County, Ohio.