10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mansfield | 1 | 47,828 | 47,535 | 0.12% | 1,549 | 30.87 | City |
| Shiloh | 2 | 13,174 | 11,681 | 7.14% | 3,364 | 3.92 | CDP |
| Shelby | 3 | 9,247 | 9,286 | -0.09% | 1,465 | 6.31 | City |
| Ontario | 4 | 6,647 | 6,662 | -0.04% | 600 | 11.08 | City |
| Roseland | 5 | 2,294 | 1,678 | 7.15% | 3,508 | 0.65 | CDP |
| Bellville | 6 | 2,000 | 1,965 | 0.35% | 702 | 2.85 | Village |
| Butler | 7 | 934 | 943 | -0.21% | 724 | 1.29 | Village |
| Lincoln Heights | 8 | 859 | 867 | 7.11% | 1,615 | 0.53 | CDP |
| Shiloh | 9 | 612 | 616 | -0.16% | 668 | 0.92 | Village |
| Lucas | 10 | 586 | 590 | -0.17% | 866 | 0.68 | Village |
Mansfield is the largest city in Richland County, with a population of 47,828.
Lucas is the smallest city in Richland County.
There are 10 cities in Richland County, Ohio.