Sioux County, NE zoning map, flood zone and property lines by address
Free, no account. Or open the Nebraska map and tap a lot.
Towns in Sioux County: Harrison.
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 20 FIRM panels covering Sioux County, the newest effective June 2022; 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 Sioux 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 NebraskaMAP statewide parcel layer (from each county assessor), so a Sioux lot shows the same lines the county assessor draws. Sioux County covers about 1,322,703 acres of land and 411 acres of water.
Mapped lines are approximate. The Sioux County assessor keeps the parcel record (Sioux County website); a licensed surveyor sets the true corners.
Zoning
Sioux County zones its unincorporated land, and Harrison zones the land inside its limits. ParcelSheet shows the use the county assessor 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 Nebraska's county zoning law (Neb. Rev. Stat. 23-114) and each city's zoning powers, local governments can allow an accessory dwelling unit on a lot with a house. Whether a Sioux 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. Sioux County is soil survey area NE165, Sioux County, Nebraska, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Sioux County must be registered with the Nebraska Department of Environment and Energy onsite wastewater program (Title 124).
Setbacks
Setbacks in Sioux 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 Harrison for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Sioux lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Sioux County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 20 flood map panels covering Sioux County, the newest effective June 2022. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Sioux County?
Open the Nebraska map, type the address, and the parcel outline from the Sioux 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 Sioux County?
Zoning in Sioux County is set by the county for unincorporated land and by each city (such as Harrison) 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 Sioux County?
Under Nebraska's county zoning law (Neb. Rev. Stat. 23-114) and each city's zoning powers, counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Sioux 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 Sioux County?
Yes. A new or changed septic system in Sioux County must be registered with the Nebraska Department of Environment and Energy onsite wastewater program (Title 124). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area NE165 (Sioux County, Nebraska).
What can I build on 5 acres in Sioux County?
Zoning in Sioux County is set by the county for unincorporated land and each city inside its own limits (such as Harrison). 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 Sioux County website.
What are the residential setbacks in Sioux County (2026)?
Setbacks in Sioux 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 Sioux County website.
Next to Sioux County: Box Butte County, Dawes County, Scotts Bluff County.
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