Calhoun County, IL zoning map, flood zone and property lines by address
Free, no account. Or open the Illinois map and tap a lot.
Towns in Calhoun County: Hardin.
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 Calhoun County has 22 FIRM panels, the newest effective December 2010; 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 Calhoun 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 Illinois county parcel layers (each county publishes its own), so a Calhoun lot shows the same lines the county supervisor of assessments draws. Calhoun County covers about 162,451 acres of land and 19,040 acres of water.
Mapped lines are approximate. The Calhoun County supervisor of assessments keeps the parcel record; a licensed surveyor sets the true corners.
Zoning
Calhoun County zones its unincorporated land, and Hardin zones the land inside its limits. ParcelSheet shows the use the county supervisor of assessments lists for the lot and links the county zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Illinois's county zoning law (Counties Code, 55 ILCS 5/5-12001 and following), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Calhoun lot can add one depends on its district; the county zoning office 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. Calhoun County is soil survey area IL013, Calhoun County, Illinois, last updated August 2026, on Web Soil Survey.
A new or changed septic system in Calhoun County needs a permit from the Calhoun County health department (Illinois Department of Public Health private sewage program; IDPH itself where the county has no health department).
Setbacks
Setbacks in Calhoun 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 Hardin for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Calhoun lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Calhoun 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 Calhoun County has 22 panels, the newest effective December 2010. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Calhoun County?
Open the Illinois map, type the address, and the parcel outline from the Calhoun County supervisor of assessments 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 Calhoun County?
Zoning in Calhoun County is set by the county for unincorporated land and by each city (such as Hardin) inside its own limits. ParcelSheet shows the use code the county supervisor of assessments lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Calhoun County?
Under Illinois's county zoning law (Counties Code, 55 ILCS 5/5-12001 and following), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Calhoun 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 Calhoun County?
Yes. A new or changed septic system in Calhoun County needs a permit from the Calhoun County health department (Illinois Department of Public Health private sewage program; IDPH itself where the county has no health department). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area IL013 (Calhoun County, Illinois).
What can I build on 5 acres in Calhoun County?
Zoning in Calhoun County is set by the county for unincorporated land and each city inside its own limits (such as Hardin). 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.
What are the residential setbacks in Calhoun County (2026)?
Setbacks in Calhoun 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.
Next to Calhoun County: Greene County, Jersey County, Pike County.
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