8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Huber Heights | 1 | 43,663 | 43,444 | 0.08% | 1,926 | 23 | City |
| Urbana | 2 | 11,224 | 11,184 | 0.06% | 1,350 | 8 | City |
| St. Paris | 3 | 1,887 | 1,883 | 0.05% | 1,165 | 2 | Village |
| Mechanicsburg | 4 | 1,682 | 1,679 | 0.06% | 1,715 | 1 | Village |
| North Lewisburg | 5 | 1,662 | 1,640 | 0.24% | 1,547 | 1 | Village |
| Christiansburg | 6 | 501 | 506 | -0.2% | 2,105 | 0 | Village |
| Woodstock | 7 | 289 | 294 | -0.34% | 1,021 | 0 | Village |
| Mutual | 8 | 126 | 126 | 0% | 933 | 0 | Village |
Huber Heights is the largest city in Champaign County, with a population of 43,663.
Mutual is the smallest city in Champaign County, with a population of 126.
There are 8 cities in Champaign County, Ohio.