County · code 18031
Decatur CountyIndiana
Decatur County is a county in Indiana with its seat in Greensburg, formed in 1822.
- Founded1822
- County seatGreensburg
- Named forStephen Decatur
- Land area373 sq mi + 0.8 sq mi water
- Population26,472 2020 Census
- Parcels mapped18,047 checked 15 October 2026
Where it is
Decatur on the map of Indiana
Indiana has 92 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1822 from Delaware County and Adams County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Decatur County was created from Delaware and Adams counties on March 4, 1822, from the New Purchase lands. The county was named after Stephen Decatur.
- 1822Decatur County created Decatur created from Delaware New Purchase (later Adams New Purchase); mistake in description corrected 24 January 1828. · Ind. Acts 1821, 6th sess., ch. 33, secs. 1-2/pp. 57-58
- 1828Boundary clarified Decatur boundaries were redefined, correcting mistake of 4 March 1822 (no change).no change· Ind. Acts 1827, 12th sess., ch. 9/p. 13
Land and parcels
What the maps cover in Decatur
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 18,047 parcels from Indiana Geographic Information Office (IndianaMap). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 6 October 2026 · checked 15 October 2026 -
Address points Official
One point per address, 12,704 in all from Indiana Geographic Information Office (IGIO).
edited 8 March 2026 · checked 13 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Decatur by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Decatur County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Decatur County.
See your own lot on these maps
Open Decatur County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Decatur County
- When was Decatur County founded?
- Decatur County was founded in 1822, formed from Delaware County and Adams County, and named after Stephen Decatur.
- What is the county seat of Decatur County?
- The county seat of Decatur County is Greensburg.
- Is there an online parcel map for Decatur County?
- Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 18,047 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Decatur County's boundary or name changed?
- Decatur County was created in 1822 from Delaware County and Adams County. Its boundary has been clarified one time since, with no change on the ground.
- Is my lot in a flood zone?
- We do not have flood maps for Decatur County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby