Dearborn County, Indiana
County seat: Lawrenceburg · Population 51,609 (2025) · 305 sq mi
Dearborn County is the 28th most populous of Indiana's 92 counties, with 51,609 people (2025 estimate). Its county seat is Lawrenceburg. It is part of the Southeast (Region 9) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 7 cities and towns and the 6 neighboring counties.
Dearborn County facts
- County seat
- Lawrenceburg
- Population (2025 estimate)
- 51,609 +1.8% since 2020
- Land area
- 305 sq mi 81st largest of 92
- Water area
- 2 sq mi
- Population density
- 169 per sq mi
- Established
- 1803
- Named after
- Henry Dearborn American politician (1751-1829)
- Largest city
- Hidden Valley 5,706
- Median household income
- $84,735
- Cities and towns
- 7 plus 3 CDPs
- ZIP codes
- 9
- Time zone
- Eastern
- FIPS code
- 18029
Cities and towns in Dearborn County
Dearborn County has 7 incorporated cities, towns and villages. Populations count the people living inside Dearborn County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Lawrenceburg (county seat) | City | 5,243 | |
| Greendale | City | 4,598 | |
| Aurora | City | 3,533 | |
| Dillsboro | Town | 1,375 | |
| Moores Hill | Town | 694 | |
| St. Leon | Town | 672 | |
| West Harrison | Town | 334 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Hidden Valley | 5,706 | |
| Bright | 5,540 | |
| Manchester | 343 |
ZIP codes in Dearborn County
9 ZIP codes reach into Dearborn County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 47001 also Ohio County
- 47012 also Franklin County
- 47018 also Ohio, Ripley and Switzerland counties
- 47022
- 47025
- 47031 also Ripley County
- 47032 also Ripley County
- 47041 also Ripley and Franklin counties
- 47060 also Franklin County
Population of Dearborn County, 2020–2025
Dearborn County grew by 933 people (+1.8%) between April 2020 and July 2025: 160 more deaths than births and a net gain of 1,076 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 50,754 |
| 2021 | 50,875 |
| 2022 | 50,978 |
| 2023 | 51,527 |
| 2024 | 51,714 |
| 2025 | 51,609 |
Neighboring counties
- Ohio County south · 5,994 people
- Ripley County west · 29,434 people
- Hamilton County, Ohio east · 838,418 people
- Franklin County north · 23,286 people
- Boone County, Kentucky southeast · 145,316 people
- Butler County, Ohio northeast · 400,128 people
Printable Dearborn County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (97 KB)
- PNG (2400 px) (97 KB)
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Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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