Indiana

Decatur

26,472
2020 population
1830
first census record
20
census records

About Decatur

Decatur, Indiana, first appears in the United States federal census in 1830, when it recorded a population of 5,887. At the most recent census, in 2020, its population stood at 26,472.

The county's recorded population has risen across the decades to its highest level in 2020.

On the ground today, 10 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202026,472
201025,740
200024,555
199023,645
198023,841
197022,738
196020,019
195018,218
194017,722
193017,308
192017,813
191018,793
190019,518
189019,277
188019,779
187019,053
186017,294
185015,107
184012,171
18305,887
Source

Population data from the United States decennial census, U.S. Census Bureau (public domain).

Historic places in Decatur

National Register of Historic Places listings in Decatur, Indiana.

Pleak, Strauther, Round Barn
Greensburg
Greensburg Downtown Historic District
Greensburg
Bromwell Wire Works
Greensburg
Westport Covered Bridge
Westport
Greensburg Carnegie Public Library
Greensburg
Jerman School
Greensburg
Knights of Pythias Building and Theatre
Greensburg
Decatur County Courthouse
Greensburg
Browse all Indianahistoric sites ›

Other counties in Indiana

Explore census history and historic records for more Indiana counties.

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Everything a full report reveals about Decatur County, Indiana

This page charts the census history of Decatur County, Indiana. A full Aubrey report for an address here pulls together everything the historical record holds about the ground, from the earliest settlement to the twentieth century:

Overview
An interactive map of the location with historic sites, battles and Native heritage plotted, and its full story era by era.
The Land
The historic sites and place names around the location, and how this land was settled and used.
Geology
The bedrock beneath the site, its age and rock type, reaching back millions of years.
LiDAR Terrain
Laser-scanned terrain that reveals earthworks and old features hidden in the landscape.
Conflict & War
The battles, raids and skirmishes fought near here, across every era of American conflict.
The Civil War
The Civil War on this ground, 1861 to 1865: who held it, and the battles, camps and regiments nearby.
The Soldiers
The men who marched from here in the Civil War, named and traced where the record allows.
Native Heritage
The Native nations who held this land, mapped across time from before European contact to today.
Settlement
Who claimed and held this ground, from Indigenous homelands through the colonial powers to the United States.
The Community
How the town grew, who came, and what kind of place it became, traced through the census record.
Rivers & Rail
The rivers, canals and railroads that connected this place between 1830 and 1911.
Notable People
The people born, buried or genuinely tied to this exact place, with their stories.
Historical Maps
Historic maps of the location layered over how it looks today.
Finds & Access
Museum objects tied to the area, and the laws on searching, collecting and access here.
Literature
The old books, county histories and archives that mention this place, quoted with their sources.
Spotlight
A deep dive into the most remarkable, lesser-known history of the place, traced back to the record.
Points of Interest
The most significant historic sites and landmarks near the location, and why they matter.
Timeline
The whole story of the location told era by era, from first peoples to the present day.
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Frequently asked about Decatur

When does Decatur first appear in the US census?
Decatur, Indiana first appears in the federal census in 1830, with a recorded population of 5,887.
What is the population of Decatur?
At the most recent federal census (2020), Decatur had a recorded population of 26,472.
How many historic places are in Decatur?
10 sites are listed on the National Register of Historic Places in Decatur, Indiana.
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