County Maps US

Putnam County, Indiana

A county in Indiana, ranked 40 of 92 by population.

CountyFIPS 18133

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

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Population
37,876
+1,180 (+3.2%) since 2020
Land area
480.5
square miles. A further 0.4% of the total area is water
Population density
78.8
people per square mile, computed rather than published
County seat
Greencastle
Seat of county government.
Established
1822
203 years ago
Largest city
Greencastle city
Population 9,924.

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 Putnam 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 Putnam 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 603 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 Putnam 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
Population37,87640th of 921,247th of 3,144
Land area480.5 sq mi15th of 922,154th of 3,144
Population density78.8 per sq mi50th of 921,093rd of 3,144
Median household income$78,37815th of 92655th of 3,143

Full data for Putnam County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population37,876Vintage 2025 Population Estimates
Population in 202036,696Vintage 2025 Population Estimates
2020 estimates base?36,735Vintage 2025 Population Estimates
Land area480.5 sq mi2025 Gazetteer Files
Water area2.2 sq mi2025 Gazetteer Files
Total area482.7 sq mi2025 Gazetteer Files
Population density?78.8 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$78,378American Community Survey 2020-2024 5-Year Estimates
Median home value$218,900American Community Survey 2020-2024 5-Year Estimates
Median age38.4American Community Survey 2020-2024 5-Year Estimates
Households14,142American Community Survey 2020-2024 5-Year Estimates
Housing units15,268American 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
-55
357 births, 412 deaths
Net migration
+171
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 6 areas bordering Putnam 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
Hendricks CountyIndiana22 mi193,510
Parke CountyIndiana18 mi16,642
Montgomery CountyIndiana17 mi38,954
Owen CountyIndiana14 mi21,886
Morgan CountyIndiana13 mi74,967
Clay CountyIndiana13 mi26,410

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.