Dubuque County, IA zoning map, flood zone and property lines by address
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Towns in Dubuque County: Dubuque, Asbury, Dyersville.
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 Dubuque County has 77 FIRM panels, the newest effective August 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 Dubuque 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 Dubuque lot shows the same lines the county assessor draws. Dubuque County covers about 389,311 acres of land and 5,224 acres of water.
Mapped lines are approximate. The Dubuque County assessor keeps the parcel record (Dubuque County website); a licensed surveyor sets the true corners.
Zoning
Dubuque County zones its unincorporated land, and Dubuque, Asbury, Dyersville each zone the land inside their 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 Dubuque 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. Dubuque County is soil survey area IA061, Dubuque County, Iowa, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Dubuque County needs a permit from the Dubuque County environmental health department (county board of health, under Iowa Department of Natural Resources rules).
Setbacks
Setbacks in Dubuque 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 Dubuque, Asbury, Dyersville for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Dubuque lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Dubuque 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 Dubuque County has 77 panels, the newest effective August 2021. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Dubuque County?
Open the Iowa map, type the address, and the parcel outline from the Dubuque 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 Dubuque County?
Zoning in Dubuque County is set by the county for unincorporated land and by each city (such as Dubuque, Asbury) 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 Dubuque 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 Dubuque 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 Dubuque County?
Yes. A new or changed septic system in Dubuque County needs a permit from the Dubuque 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 IA061 (Dubuque County, Iowa).
What can I build on 5 acres in Dubuque County?
Zoning in Dubuque County is set by the county for unincorporated land and each city inside its own limits (such as Dubuque, Asbury). 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 Dubuque County website.
What are the residential setbacks in Dubuque County (2026)?
Setbacks in Dubuque 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 Dubuque County website.
Next to Dubuque County: Clayton County, Delaware County, Jackson County, Jones County.
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