Knox County, IN zoning map, flood zone and property lines by address
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Towns in Knox County: Vincennes, Bicknell.
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 has 29 FIRM panels covering Knox County, the newest effective January 2015; 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 Knox 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 Knox lot shows the same lines the county assessor draws. Knox County covers about 330,132 acres of land and 5,167 acres of water.
Mapped lines are approximate. The Knox County assessor keeps the parcel record (Knox County website); a licensed surveyor sets the true corners.
Zoning
Knox County zones its unincorporated land, and Vincennes, Bicknell 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 Knox 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. Knox County is soil survey area IN083, Knox County, Indiana, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Knox County needs a permit from the Knox County health department (Indiana Department of Health onsite sewage program).
Setbacks
Setbacks in Knox 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 Vincennes and Bicknell for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Knox lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Knox County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 29 flood map panels covering Knox County, the newest effective January 2015. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Knox County?
Open the Indiana map, type the address, and the parcel outline from the Knox 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 Knox County?
Zoning in Knox County is set by the county for unincorporated land and by each city (such as Vincennes, Bicknell) 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 Knox 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 Knox 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 Knox County?
Yes. A new or changed septic system in Knox County needs a permit from the Knox 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 IN083 (Knox County, Indiana).
What can I build on 5 acres in Knox County?
Zoning in Knox County is set by the county for unincorporated land and each city inside its own limits (such as Vincennes, Bicknell). 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 Knox County website.
What are the residential setbacks in Knox County (2026)?
Setbacks in Knox 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 Knox County website.
Next to Knox County: Daviess County, Gibson County, Greene County, Pike County, Sullivan County.
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