Decatur County, Indiana

Decatur County, Indiana
Decatur County Courthouse in Greensburg
Flag of Decatur County, Indiana
Official logo of Decatur County, Indiana
Map of Indiana highlighting Decatur County
Location within the U.S. state of Indiana
Coordinates: 39°18′N 85°30′W / 39.3°N 85.5°W / 39.3; -85.5
Country United States
State Indiana
FoundedDecember 12, 1821 (authorized)
1822 (organized)
Named forStephen Decatur, Jr.
SeatGreensburg
Largest cityGreensburg
Area
 • Total
373.32 sq mi (966.9 km2)
 • Land372.57 sq mi (965.0 km2)
 • Water0.76 sq mi (2.0 km2)  0.20%
Population
 (2020)
 • Total
26,472
 • Estimate 
(2025)
26,576 Increase
 • Density71.052/sq mi (27.433/km2)
Congressional district9th
Websitewww.decaturcounty.in.gov
Indiana county number 16

Decatur County is a county in the U.S. state of Indiana. As of the 2020 United States census, the population was 26,472. The county seat (and only incorporated city) is Greensburg.