County Maps US

Jefferson County, Indiana

A county in Indiana, ranked 51 of 92 by population.

CountyFIPS 18077

Within Indiana
Jefferson County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Madison, the county seat, located via the 2025 Census Gazetteer.

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Population
33,279
+188 (+0.6%) since 2020
Land area
360.7
square miles. A further 0.6% of the total area is water
Population density
92.3
people per square mile, computed rather than published
County seat
Madison
Seat of county government.
Established
1810
215 years ago
Largest city
Madison city
Population 12,304.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Jefferson County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Jefferson County, Indiana from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 708 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Jefferson County ranks

Position among the 92 counties of Indiana, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn IndianaNationally
Population33,27951st of 921,367th of 3,144
Land area360.7 sq mi69th of 922,650th of 3,144
Population density92.3 per sq mi44th of 92972nd of 3,144
Median household income$64,57765th of 921,666th of 3,143

Full data for Jefferson County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population33,279Vintage 2025 Population Estimates
Population in 202033,091Vintage 2025 Population Estimates
2020 estimates base?33,139Vintage 2025 Population Estimates
Land area360.7 sq mi2025 Gazetteer Files
Water area2.3 sq mi2025 Gazetteer Files
Total area363 sq mi2025 Gazetteer Files
Population density?92.3 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$64,577American Community Survey 2020-2024 5-Year Estimates
Median home value$194,600American Community Survey 2020-2024 5-Year Estimates
Median age41.8American Community Survey 2020-2024 5-Year Estimates
Households12,790American Community Survey 2020-2024 5-Year Estimates
Housing units14,517American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-86
357 births, 443 deaths
Net migration
+302
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Jefferson County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Jennings CountyIndiana21 mi27,622
Scott CountyIndiana20 mi25,053
Trimble CountyKentucky17 mi8,701
Switzerland CountyIndiana15 mi10,037
Ripley CountyIndiana13 mi29,434
Clark CountyIndiana9.1 mi130,451
Carroll CountyKentucky8.9 mi11,141

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 92 counties of Indiana

Open the interactive Indiana county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.