Blog · October 14, 2026 · Wisconsin
Reading the West Allis Plat Map for a lot
Lots in West Allis trace back to recorded plats filed with the county.
Main page: Milwaukee County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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If a legal description for land in West Allis cites a lot number, the West Allis plat map is where those numbers come from. This West Allis guide covers: where to request a copy, plat versus tax map, and the details that matter to buyers.
Tracking down the West Allis plat map
For a lot in West Allis, look for the plat book reference on the parcel record; bring that to the recorder's office or its online index.
The viewer Milwaukee County publishes
Your first stop is the Milwaukee County parcel viewer; it maps every tax parcel around Greendale and Hales Corners. When a rural tract has no street number, follow Interstate 794 on the aerial until the lines appear, then click inside the one you want. On ground around Shorewood, the parcel card typically gives the owner of record, assessed acreage, a parcel ID and sometimes recent sales.
Getting answers from the right desk
If the acreage or value on a parcel near St. Francis looks off go to the county real property listing office, since that office keeps the assessment data. Building or septic questions for a lot near Hales Corners are for the local planning and health departments, and the answer depends on jurisdiction.
Field tips
Most viewers work in a phone browser, useful out on a road near Wauwatosa, though signal can drop in rural spots. A saved image of the lot near Hales Corners and its lines keeps working without signal.
Metes and bounds instead
Rural land near St. Francis that was never subdivided is often described by metes and bounds or survey description; look for a recorded survey for land near West Milwaukee.
Recorded documents worth pulling
For anything that matters, request the recorded deed through the Register of Deeds; the parcel map near Wauwatosa only summarizes it. Long-held tracts near Wauwatosa may go back through many deeds, and a title company earns its fee on a real sale.
West Allis and the county around it
West Allis is part of Milwaukee County, Wisconsin, so its parcels are on the county's map. For a home near Greendale, city or town hall handles matters such as zoning, permits and utilities inside its limits, and the county still keeps the parcel and deed records. Lots just outside the city limits toward West Milwaukee generally follows county rules rather than the town's.
Replats and vacations
Lots near Shorewood can be combined or reconfigured by a replat, search the index for replats of the same subdivision; street vacations show up in the records too.
Getting your bearings
Milwaukee is the county seat, where most land records are kept. You'll also find West Milwaukee, Wauwatosa, Hales Corners, and Greendale. Roughly 916,205 people call Milwaukee County home (Census estimate, 2023) on some 241 square miles. Milwaukee County was organized in 1835, so old deeds can run back a long way. Features like Menomonee River and Kinnickinnic River make handy reference points on the map near West Milwaukee.
How land is described here
Wisconsin is laid out under the Public Land Survey System, so rural legal descriptions near West Milwaukee cite section, township and range. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though corrections make some sections near Wauwatosa odd-sized. Keep the legal description for land near Hales Corners for any title or survey request.
What the map can't tell you
Parcel lines are drawn for taxes, not surveyed, so the edge of a yard near Greendale often sits several feet off the line on screen. For acreage around Wauwatosa, records update in batches, so a deed recorded last month might lag behind.
Neighboring parcel maps
Milwaukee County touches Muskegon County, MI, Ottawa County, MI, Ozaukee County, Racine County, and Washington County; every one of them runs a separate parcel map. A tract near the line by Shorewood can show up across two assessors' files, so open the neighboring map as well. On ground around West Milwaukee, the Platbookmapper state page links each neighboring county map across Wisconsin.
Recorded plat or GIS layer
The tax map on the Milwaukee County parcel viewer is a summary, whereas the plat carries surveyed dimensions.
Lots, blocks and easements
Easements on the plat near Shorewood can block a shed or pool; read the notes on the sheet.
Online indexes and office visits
On ground around Shorewood, many recorder offices offer an online index, while others require a visit or a request; copy fees are usually small.
West Allis: common questions
How far back do plats go near Hales Corners?
It depends, but older plats near Wauwatosa may be on film or paper, including older subdivisions.
What does lot 7, block 3 mean near St. Francis?
It depends, but it points to a spot on the plat for that subdivision near Shorewood.
Where can I find the West Allis plat map?
In most cases, recorded plats near Hales Corners are filed with the Register of Deeds; small copy fees are common.
What is a replat around Shorewood?
Usually, lot splits in West Allis go through the planning office, often with a surveyor's drawing.
What's a legal description in West Allis?
Out toward St. Francis, Deeds use lot and block, metes and bounds or survey descriptions; copy it for any survey or title request.
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.