County Maps US

Morgan County, Indiana

A county in Indiana, ranked 24 of 92 by population.

CountyFIPS 18109

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

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Population
74,967
+3,125 (+4.3%) since 2020
Land area
403.8
square miles. A further 1.4% of the total area is water
Population density
186
people per square mile, computed rather than published
County seat
Martinsville
Seat of county government.
Established
1821
204 years ago
Largest city
Martinsville city
Population 12,141.

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 Morgan 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 Morgan 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 710 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 Morgan 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
Population74,96724th of 92754th of 3,144
Land area403.8 sq mi41st of 922,505th of 3,144
Population density186 per sq mi22nd of 92590th of 3,144
Median household income$79,42913th of 92609th of 3,143

Full data for Morgan County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population74,967Vintage 2025 Population Estimates
Population in 202071,842Vintage 2025 Population Estimates
2020 estimates base?71,776Vintage 2025 Population Estimates
Land area403.8 sq mi2025 Gazetteer Files
Water area5.6 sq mi2025 Gazetteer Files
Total area409.4 sq mi2025 Gazetteer Files
Population density?186 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$79,429American Community Survey 2020-2024 5-Year Estimates
Median home value$237,600American Community Survey 2020-2024 5-Year Estimates
Median age41.7American Community Survey 2020-2024 5-Year Estimates
Households28,279American Community Survey 2020-2024 5-Year Estimates
Housing units30,046American 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
-75
734 births, 809 deaths
Net migration
+1,007
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 Morgan 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
Johnson CountyIndiana20 mi174,262
Hendricks CountyIndiana20 mi193,510
Monroe CountyIndiana14 mi143,345
Putnam CountyIndiana13 mi37,876
Owen CountyIndiana11 mi21,886
Brown CountyIndiana7.0 mi15,777
Marion CountyIndiana4.1 mi992,196

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.