| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lawrenceburg | 1 | 5,273 | 5,136 | 0.57% | 998 | 5 | City |
| Greendale | 2 | 4,598 | 4,606 | 0% | 812 | 6 | City |
| Aurora | 3 | 3,547 | 3,485 | 0.4% | 1,077 | 3 | City |
| Dillsboro | 4 | 1,377 | 1,370 | 0.15% | 1,017 | 1 | Town |
| Moores Hill | 5 | 697 | 678 | 0.43% | 1,621 | 0 | Town |
| St. Leon | 6 | 675 | 658 | 0.45% | 99 | 7 | Town |
| West Harrison | 7 | 335 | 330 | 0.3% | 1,516 | 0 | Town |
| Mount Carmel | 8 | 90 | 87 | 0% | 2,045 | 0 | Town |
Lawrenceburg is the largest city in Dearborn County, with a population of 5,273.
Mount Carmel is the smallest city in Dearborn County, with a population of 90.
There are 8 cities in Dearborn County, Indiana.