8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lexington | 1 | 4,824 | 4,848 | -0.08% | 1,185 | 4 | Village |
| Mount Gilead | 2 | 3,565 | 3,499 | 0.31% | 1,053 | 3 | Village |
| Cardington | 3 | 2,264 | 2,081 | 1.39% | 1,129 | 2 | Village |
| Edison | 4 | 454 | 420 | 1.34% | 1,582 | 0 | Village |
| Marengo | 5 | 281 | 280 | 0% | 1,673 | 0 | Village |
| Fulton | 6 | 252 | 248 | 0.4% | 1,537 | 0 | Village |
| Chesterville | 7 | 203 | 194 | 1% | 990 | 0 | Village |
| Sparta | 8 | 123 | 122 | 0% | 1,414 | 0 | Village |
Lexington is the largest city in Morrow County, with a population of 4,824.
Sparta is the smallest city in Morrow County, with a population of 123.
There are 8 cities in Morrow County, Ohio.