10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bright | 1 | 5,899 | 5,801 | 0.22% | 470 | 12.54 | CDP |
| Hidden Valley | 2 | 5,603 | 5,075 | 0.25% | 1,321 | 4.24 | CDP |
| Lawrenceburg | 3 | 5,232 | 5,137 | 0.36% | 990 | 5.29 | City |
| Greendale | 4 | 4,536 | 4,606 | -0.31% | 801 | 5.66 | City |
| Aurora | 5 | 3,525 | 3,482 | 0.26% | 1,071 | 3.29 | City |
| Dillsboro | 6 | 1,394 | 1,366 | 0.43% | 1,030 | 1.35 | Town |
| Moores Hill | 7 | 695 | 675 | 0.58% | 1,616 | 0.43 | Town |
| St. Leon | 8 | 667 | 662 | 0.15% | 98 | 6.83 | Town |
| West Harrison | 9 | 336 | 331 | 0.3% | 1,520 | 0.22 | Town |
| Mount Carmel | 10 | 79 | 78 | 0% | 1,795 | 0.04 | Town |
Bright is the largest city in Dearborn County, with a population of 5,899.
Mount Carmel is the smallest city in Dearborn County.
There are 10 cities in Dearborn County, Indiana.