Brown County, WI zoning map, flood zone and property lines by address

Towns in Brown County: Green Bay, De Pere, Howard.

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 Brown County has 162 FIRM panels, the newest effective May 2023; coastal V zones, where waves add to the flood, are mapped along its shore.

The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Brown 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 Wisconsin statewide parcel layer (from each county, compiled by the State Cartographer), so a Brown lot shows the same lines the real property lister draws. Brown County covers about 339,261 acres of land and 54,808 acres of water.

Mapped lines are approximate. The Brown County real property lister keeps the parcel record (Brown County website); a licensed surveyor sets the true corners.

Zoning

In Wisconsin zoning is set by the county, the town or the city or village, depending on where the lot is: in Brown County, Green Bay, De Pere, Howard each zone the land inside their limits. ParcelSheet shows the use code on the lot's parcel record and the municipality it sits in; the county, town or city zoning office has the district, the uses it allows and the lot size it needs. The Brown County website lists the county's municipalities.

ADU and guest houses

Under Wisconsin's zoning laws (Wis. Stat. 59.69 for counties, 60.61 for towns and 62.23 for cities), the county, the town or the city or village, depending on where the lot is can allow an accessory dwelling unit on a lot with a house. Whether a Brown lot can add one depends on its district; the county, town or city 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. Brown County is soil survey area WI009, Brown County, Wisconsin, last updated September 2026, on Web Soil Survey.

A new or changed septic system in Brown County needs a permit from the Brown County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services).

Setbacks

Setbacks in Brown County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county, town or city zoning office gives them for the lot's district, and Green Bay, De Pere, Howard for land inside their limits.

Hazards that apply

• Storm surge. Brown County has coastal V zones on its FEMA map, so storm surge reaches its shore. The county's evacuation zones are on its emergency management site; ParcelSheet shows the FEMA zone and the 3 ft sea level rise map at the lot.
• Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Brown lot and the Forest Service wildfire hazard rating at it.

Questions

Is my house in a flood zone in Brown 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 Brown County has 162 panels, the newest effective May 2023. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.

How do I find property lines in Brown County?

Open the Wisconsin map, type the address, and the parcel outline from the Brown County real property lister 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 Brown County?

Zoning in Brown County is set by the county, the town or the city or village, depending on where the lot is (such as Green Bay, De Pere). ParcelSheet shows the use code on the parcel record and names the municipality; the county, town or city zoning office has the final word.

Can I build an ADU in Brown County?

Under Wisconsin's zoning laws (Wis. Stat. 59.69 for counties, 60.61 for towns and 62.23 for cities), the county, the town or the city or village, depending on where the lot is can allow an accessory dwelling unit, and each sets its own rules. In Brown County ask the county, town or city 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 Brown County?

Yes. A new or changed septic system in Brown County needs a permit from the Brown County sanitary permit office under the state POWTS rules (Department of Safety and Professional Services). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area WI009 (Brown County, Wisconsin).

What can I build on 5 acres in Brown County?

Zoning in Brown County is set by the county, the town or the city or village, depending on where the lot is (such as Green Bay, De Pere). 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 county, town or city zoning office has the district and its rules. See the Brown County website.

What are the residential setbacks in Brown County (2026)?

Setbacks in Brown County come from the zoning code of the municipality the lot sits in: 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 county, town or city zoning office gives them for the district. See the Brown County website.

Next to Brown County: Calumet County, Door County, Kewaunee County, Manitowoc County, Oconto County, Outagamie County, Shawano County.

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