Decatur County, IN zoning map, flood zone and property lines by address
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Towns in Decatur County: Greensburg, Westport, Saint Paul.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Decatur County has 43 FIRM panels, the newest effective October 2013; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Decatur house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Indiana statewide parcel layer (IndianaMap, from each county), so a Decatur lot shows the same lines the county assessor draws. Decatur County covers about 238,443 acres of land and 483 acres of water.
Mapped lines are approximate. The Decatur County assessor keeps the parcel record (Decatur County website); a licensed surveyor sets the true corners.
Zoning
Decatur County zones its unincorporated land, and Greensburg, Westport each zone the land inside their limits. ParcelSheet shows the use the county assessor lists for the lot and links the county plan commission for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Indiana's planning and zoning law (Indiana Code 36-7-4), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Decatur lot can add one depends on its district; the county plan commission has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Decatur County is soil survey area IN031, Decatur County, Indiana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Decatur County needs a permit from the Decatur County health department (Indiana Department of Health onsite sewage program).
Setbacks
Setbacks in Decatur County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district, and Greensburg and Westport for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Decatur lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Decatur County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Decatur County has 43 panels, the newest effective October 2013. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Decatur County?
Open the Indiana map, type the address, and the parcel outline from the Decatur County assessor shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Decatur County?
Zoning in Decatur County is set by the county for unincorporated land and by each city (such as Greensburg, Westport) inside its own limits. ParcelSheet shows the use code the county assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Decatur County?
Under Indiana's planning and zoning law (Indiana Code 36-7-4), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Decatur County ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Decatur County?
Yes. A new or changed septic system in Decatur County needs a permit from the Decatur County health department (Indiana Department of Health onsite sewage program). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area IN031 (Decatur County, Indiana).
What can I build on 5 acres in Decatur County?
Zoning in Decatur County is set by the county for unincorporated land and each city inside its own limits (such as Greensburg, Westport). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the Decatur County website.
What are the residential setbacks in Decatur County (2026)?
Setbacks in Decatur County come from the zoning code of the county, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the Decatur County website.
Next to Decatur County: Bartholomew County, Franklin County, Jennings County, Ripley County, Rush County, Shelby County.
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