| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lexington | 1 | 4,846 | 4,850 | -0.04% | 1,190 | 4 | Village |
| Mount Gilead | 2 | 3,591 | 3,502 | 0.45% | 1,060 | 3 | Village |
| Cardington | 3 | 2,280 | 2,084 | 1.47% | 1,137 | 2 | Village |
| Edison | 4 | 455 | 421 | 1.34% | 1,585 | 0 | Village |
| Marengo | 5 | 285 | 280 | 0% | 1,696 | 0 | Village |
| Fulton | 6 | 255 | 247 | 0.39% | 1,555 | 0 | Village |
| Chesterville | 7 | 209 | 197 | 0.48% | 1,020 | 0 | Village |
| Sparta | 8 | 127 | 125 | 0% | 1,460 | 0 | Village |
Lexington is the largest city in Morrow County, with a population of 4,846.
Sparta is the smallest city in Morrow County, with a population of 127.
There are 8 cities in Morrow County, Ohio.