Jefferson County, Indiana
County seat: Madison · Population 33,279 (2025) · 361 sq mi
Jefferson County is the 51st most populous of Indiana's 92 counties, with 33,279 people (2025 estimate). Its county seat is Madison. It is part of the Southeast (Region 9) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 4 cities and towns and the 7 neighboring counties.
Jefferson County facts
- County seat
- Madison
- Population (2025 estimate)
- 33,279 +0.4% since 2020
- Land area
- 361 sq mi 69th largest of 92
- Water area
- 2 sq mi
- Population density
- 92 per sq mi
- Established
- 1811
- Named after
- Thomas Jefferson Founding Father, U.S. president from 1801 to 1809 (1743–1826)
- Largest city
- Madison 12,304
- Median household income
- $64,577
- Cities and towns
- 4 plus 3 CDPs
- ZIP codes
- 11
- Time zone
- Eastern
- FIPS code
- 18077
Cities and towns in Jefferson County
Jefferson County has 4 incorporated cities, towns and villages. Populations count the people living inside Jefferson County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Madison (county seat) | City | 12,304 | |
| Hanover | Town | 3,866 | |
| Dupont | Town | 340 | |
| Brooksburg | Town | 71 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Canaan | 120 | |
| Deputy | 37 | |
| Kent | 0 |
ZIP codes in Jefferson County
11 ZIP codes reach into Jefferson County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 47043 also Switzerland County
- 47138 also Scott County
- 47147 also Clark and Scott counties
- 47170 also Scott and Washington counties
- 47224 also Switzerland County
- 47227 also Jennings County
- 47230 also Scott and Jennings counties
- 47231 also Jennings County
- 47243
- 47250 also Ripley and Switzerland counties
- 47270 also Jennings County
Population of Jefferson County, 2020–2025
Jefferson County grew by 140 people (+0.4%) between April 2020 and July 2025: 528 more deaths than births and a net gain of 674 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 33,091 |
| 2021 | 32,935 |
| 2022 | 32,812 |
| 2023 | 32,971 |
| 2024 | 33,064 |
| 2025 | 33,279 |
Neighboring counties
- Jennings County northwest · 27,622 people
- Scott County southwest · 25,053 people
- Trimble County, Kentucky southeast · 8,701 people
- Switzerland County east · 10,037 people
- Ripley County northeast · 29,434 people
- Clark County southwest · 130,451 people
- Carroll County, Kentucky southeast · 11,141 people
Printable Jefferson 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) (86 KB)
- PNG (2400 px) (76 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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