Crawford County, IA zoning map, flood zone and property lines by address
Free, no account. Or open the Iowa map and tap a lot.
Towns in Crawford County: Denison.
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 Crawford County has 62 FIRM panels, the newest effective December 2021; 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 Crawford 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 Iowa county parcel layers (each county publishes its own), so a Crawford lot shows the same lines the county assessor draws. Crawford County covers about 457,087 acres of land and 537 acres of water.
Mapped lines are approximate. The Crawford County assessor keeps the parcel record (Crawford County website); a licensed surveyor sets the true corners.
Zoning
Crawford County zones its unincorporated land, and Denison 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 Iowa's county zoning law (Iowa Code Chapter 335), local governments can allow an accessory dwelling unit on a lot with a house. Whether a Crawford 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. Crawford County is soil survey area IA047, Crawford County, Iowa, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Crawford County needs a permit from the Crawford County environmental health department (county board of health, under Iowa Department of Natural Resources rules).
Setbacks
Setbacks in Crawford 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 Denison for land inside its limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Crawford lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Crawford 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 Crawford County has 62 panels, the newest effective December 2021. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Crawford County?
Open the Iowa map, type the address, and the parcel outline from the Crawford 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 Crawford County?
Zoning in Crawford County is set by the county for unincorporated land and by each city (such as Denison) 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 Crawford County?
Under Iowa's county zoning law (Iowa Code Chapter 335), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In Crawford 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 Crawford County?
Yes. A new or changed septic system in Crawford County needs a permit from the Crawford County environmental health department (county board of health, under Iowa Department of Natural Resources rules). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area IA047 (Crawford County, Iowa).
What can I build on 5 acres in Crawford County?
Zoning in Crawford County is set by the county for unincorporated land and each city inside its own limits (such as Denison). 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 Crawford County website.
What are the residential setbacks in Crawford County (2026)?
Setbacks in Crawford 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 Crawford County website.
Next to Crawford County: Carroll County, Harrison County, Ida County, Monona County, Sac County, Shelby County.
The Iowa map · All Iowa counties · Flood zones explained · FIRM panels and LOMAs · All 50 states