10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lexington | 1 | 4,842 | 4,852 | -0.04% | 1,189 | 4.07 | Village |
| Mount Gilead | 2 | 3,553 | 3,502 | 0.28% | 1,049 | 3.39 | Village |
| Cardington | 3 | 2,114 | 2,081 | 0.33% | 1,054 | 2.01 | Village |
| Candlewood Lake | 4 | 1,189 | 783 | 0.17% | 515 | 2.31 | CDP |
| Iberia | 5 | 500 | 624 | 0.81% | 130 | 3.85 | CDP |
| Edison | 6 | 455 | 420 | 1.56% | 1,585 | 0.29 | Village |
| Marengo | 7 | 280 | 280 | 0% | 1,667 | 0.17 | Village |
| Fulton | 8 | 249 | 249 | 0% | 1,518 | 0.16 | Village |
| Chesterville | 9 | 195 | 194 | 0% | 951 | 0.20 | Village |
| Sparta | 10 | 123 | 122 | 0% | 1,414 | 0.09 | Village |
Lexington is the largest city in Morrow County, with a population of 4,842.
Sparta is the smallest city in Morrow County.
There are 10 cities in Morrow County, Ohio.