8 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lawrenceburg | 1 | 5,254 | 5,139 | 0.36% | 994 | 5 | City |
| Greendale | 2 | 4,568 | 4,606 | -0.13% | 807 | 6 | City |
| Aurora | 3 | 3,534 | 3,476 | 0.28% | 1,074 | 3 | City |
| Dillsboro | 4 | 1,396 | 1,368 | 0.36% | 1,031 | 1 | Town |
| Moores Hill | 5 | 705 | 678 | 0.71% | 1,640 | 0 | Town |
| St. Leon | 6 | 673 | 661 | 0.3% | 99 | 7 | Town |
| West Harrison | 7 | 333 | 329 | 0.3% | 1,507 | 0 | Town |
| Mount Carmel | 8 | 78 | 77 | 0% | 1,773 | 0 | Town |
Lawrenceburg is the largest city in Dearborn County, with a population of 5,254.
Mount Carmel is the smallest city in Dearborn County, with a population of 78.
There are 8 cities in Dearborn County, Indiana.