County Maps US

Union County, Indiana

A county in Indiana, ranked 91 of 92 by population.

CountyFIPS 18161

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

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Population
6,863
-222 (-3.1%) since 2020
Land area
161.2
square miles. A further 2.4% of the total area is water
Population density
42.6
people per square mile, computed rather than published
County seat
Liberty
Seat of county government.
Established
1821
204 years ago
Largest city
Liberty town
Population 1,967.

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 Union 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 Union 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 675 by 800 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 Union 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
Population6,86391st of 922,665th of 3,144
Land area161.2 sq mi90th of 923,048th of 3,144
Population density42.6 per sq mi83rd of 921,617th of 3,144
Median household income$76,42420th of 92753rd of 3,143

Full data for Union County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population6,863Vintage 2025 Population Estimates
Population in 20207,085Vintage 2025 Population Estimates
2020 estimates base?7,090Vintage 2025 Population Estimates
Land area161.2 sq mi2025 Gazetteer Files
Water area4.0 sq mi2025 Gazetteer Files
Total area165.2 sq mi2025 Gazetteer Files
Population density?42.6 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$76,424American Community Survey 2020-2024 5-Year Estimates
Median home value$173,500American Community Survey 2020-2024 5-Year Estimates
Median age43.9American Community Survey 2020-2024 5-Year Estimates
Households2,940American Community Survey 2020-2024 5-Year Estimates
Housing units3,255American 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
-35
55 births, 90 deaths
Net migration
-38
More people moved out than moved in.

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

The 5 areas bordering Union 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
Fayette CountyIndiana13 mi23,533
Wayne CountyIndiana13 mi66,169
Franklin CountyIndiana12 mi23,286
Preble CountyOhio11 mi40,664
Butler CountyOhio3.2 mi400,128

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.