Blog · October 14, 2026 · Wisconsin
Hales Corners Flood Zone Map, Wisconsin: a practical guide
Flood zones are set by FEMA, and checking one near West Allis takes a few minutes.
Main page: Milwaukee County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Weighing a property around Wauwatosa? The Hales Corners flood zone map tells you whether FEMA puts it in a high-risk zone, and it costs nothing to check. Covered here for Hales Corners: finding the address on FEMA's map, decoding A, AE and X, and confirming the outline on the county map.
Getting started with the Hales Corners flood zone map
The official source is FEMA's Flood Map Service Center: type an address near West Milwaukee, then open the map view for that panel. A tract near Greendale without an address can still be found: search the nearest road and click the spot.
The viewer Milwaukee County publishes
Property in and around Oak Creek can be looked up on the Milwaukee County parcel viewer, free to use and open without a login. For acreage around St. Francis, enter a street address, an owner's name or a parcel number, and the matching parcel lights up. If you're looking near West Allis, the record panel normally shows the owner of record, acreage on the tax roll, the parcel number and in many cases the last transfer.
Neighboring parcel maps
Milwaukee County borders Muskegon County, MI, Ottawa County, MI, Ozaukee County, Racine County, and Washington County; every one of them runs a separate parcel map. Ground near West Allis that runs to the line can be split across two assessors' files, so open the adjacent map too. In and around Wauwatosa, the Platbookmapper state page lists each bordering county map for Wisconsin.
Before you lean on the lines
Acreage on the record is a tax-roll number; only a licensed surveyor establishes the real corners for a parcel near Greendale. Out toward St. Francis, owner names and values update on a schedule, so a deed recorded last month may not show yet.
City limits and county records
Hales Corners sits in Milwaukee County, Wisconsin, which means parcel data comes from the county. For a home near West Allis, the municipality handles matters such as zoning, permits and utilities for lots inside the boundary, while the county keeps the tax map. Acreage past the town limits near Greendale generally follows county rules instead.
Offices that can help
Questions about value or the owner field for land near Wauwatosa are handled by the county real property listing office, which maintains the tax roll. Questions about what you can build around Wauwatosa go to planning, building or health offices, depending on whether the land is inside town limits.
Reading the legal description
Wisconsin is laid out under the Public Land Survey System, so deeds around Wauwatosa reference sections and townships. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though corrections make some sections near West Milwaukee odd-sized. Write down the legal description for the tract near St. Francis for any title or survey request.
What the zone letters mean
In and around St. Francis, any A or V zone are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any year. Out toward Wauwatosa, shaded Zone X marks moderate flood hazard, roughly the 100- to 500-year range; plain X, or C on older maps, is minimal risk.
Parcel lines plus flood zones
Where a floodplain cuts across acreage near Wauwatosa, what matters is where the building sits.
Milwaukee County in a few facts
Milwaukee holds the county offices, home to the main records offices. Other places on the map include Greendale, West Allis, West Milwaukee, and Wauwatosa. Roughly 916,205 people call Milwaukee County home (Census Bureau estimate, 2023) spread over some 241 square miles. Milwaukee County dates to 1835, and some chains of title near Oak Creek are long. Places such as Menomonee River and Kinnickinnic River make handy reference points on the map near West Allis.
A short flood checklist
Ask the listing agent whether the home has flooded for the house near West Milwaukee; getting a quote early keeps the budget honest.
Lenders and permits
For a parcel near Oak Creek, an Elevation Certificate from a surveyor helps: it compares the building to the BFE. Remodeling a house in a zone near Oak Creek can trigger elevation rules; ask the local floodplain administrator early.
Beyond the mapped zones
Low-lying fields near Oak Creek aren't always studied in detail, so look for water marks and debris lines. Marshy spots near St. Francis can limit building too; the National Wetlands Inventory mapper shows mapped wetlands.
Hales Corners: common questions
Why did my flood zone near St. Francis change?
It depends, but a new study can move a zone line near Greendale, so look at the panel date.
What is a base flood elevation around West Allis?
Short answer: the base flood elevation is the water level expected in the 1% annual chance flood; surveyors near Greendale use it often.
Is Zone X safe from flooding around Greendale?
It depends, but X zones around West Milwaukee are lower risk, not no risk, and floods still happen outside high-risk zones.
Is AE a high-risk flood zone around West Milwaukee?
For most people, both are high-risk zones, but only AE has a base flood elevation, so builders near Wauwatosa design to that elevation.
Who keeps deeds for property in Hales Corners?
For land near Greendale, assessment goes to the county real property listing office and deeds to the Register of Deeds; planning offices cover zoning near Oak Creek
Open the official Milwaukee County, WI parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.