Blog · October 14, 2026 · Wisconsin
Grafton Plat Map, Wisconsin: plats and lots
A recorded plat shows how land near Port Washington was divided into lots.
Main page: Ozaukee County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Buying a lot in a subdivision near Thiensville? What you want is the Grafton plat map, because the recorded plat shows how the land was divided. Covered here for Grafton: where to request a copy, plat versus tax map, and the details that matter to buyers.
Tracking down the Grafton plat map
For land around Newburg, the deed usually cites the plat; bring that to the recorder's office or its online index.
The free map to start with
Begin with the Ozaukee County parcel viewer; it covers every assessed parcel in the county, Mequon included. Out toward Saukville, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. If you're looking near Newburg, the record panel normally shows the owner of record, acreage on the tax roll, the parcel number and often a sale date.
Grafton and the county around it
Grafton is part of Ozaukee County, Wisconsin, which means parcel data comes from the county. For a tract near Saukville, city or town hall handles matters such as zoning, permits and utilities within town limits, and the county still keeps the parcel and deed records. Acreage past the city limits toward Saukville often follows county rules, not municipal ones.
Getting your bearings
Port Washington serves as the county seat, where most land records are kept. You'll also find Cedarburg, Saukville, and Thiensville, where town lots give way to larger tracts. About 93,460 people call Ozaukee County home (Census estimate, 2023) on about 233 square miles. Ozaukee County was organized in 1853, and some chains of title near Thiensville are long. Landmarks such as Lake Michigan and Lion's Den Gorge Nature Preserve are easy to spot when you zoom out from Saukville.
A word on accuracy
Acreage on the record is an assessed number; just a licensed surveyor can set the real lines for a parcel near Saukville. Closer to Thiensville, records update in batches, so a deed recorded last month might lag behind.
Two different maps
The Ozaukee County parcel viewer draws parcels for taxes, whereas the plat carries surveyed dimensions.
Who handles what
If the acreage or value on a parcel near Thiensville looks off are handled by the county real property listing office, which maintains the tax roll. Zoning, permits and septic questions near Mequon go to planning, building or health offices, town or county, depending on location.
When a parcel crosses a boundary
Ozaukee County touches Muskegon County, MI, Oceana County, MI, Milwaukee County, Sheboygan County, and Washington County; every one of them runs a separate parcel map. Ground near Cedarburg that runs to the line can show up in two county records, so check the adjacent map as well. Closer to Port Washington, the Platbookmapper state page lists each bordering county map for Wisconsin.
Where the recorded documents are
Before you sign anything, request the recorded deed from the Register of Deeds; the parcel map near Port Washington only summarizes it. Inherited tracts near Saukville can trace back through many deeds, and a title company is worth hiring on a real sale.
Lots, blocks and easements
Easements on the plat near Port Washington can block a shed or pool; read the notes on the sheet.
When there's no plat
Rural land near Port Washington that was never subdivided may have no plat at all; look for a recorded survey for land near Thiensville.
Amended plats
An amended plat may change lots around Thiensville, search the index for replats of the same subdivision; vacated streets or alleys also get recorded.
Using it on a phone
Most viewers work in a phone browser, useful out on a road near Cedarburg, though signal can drop in rural spots. A screenshot of the parcel near Newburg with its ID helps when you meet an owner or agent.
Reading the legal description
Wisconsin is laid out under the Public Land Survey System, so rural legal descriptions near Mequon cite section, township and range. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though corrections make some sections near Thiensville odd-sized. Copy the legal description from the record for the parcel near Mequon when you talk to a surveyor.
Requesting the plat
If you're looking near Thiensville, many recorder offices offer an online index, otherwise call or visit with the reference; copy fees are usually small.
Questions about the Grafton plat map
Who has recorded plats for land near Saukville?
For most people, recorded plats near Mequon are filed with the Register of Deeds.
What does lot 7, block 3 mean near Thiensville?
In most cases, it points to a spot on the plat for that subdivision near Cedarburg; the deed names the subdivision.
How is a plat different from the parcel map near Newburg?
The plat near Cedarburg is recorded, while the GIS layer is an approximation; trust the plat when they differ.
What do the dashed lines on a plat mean around Mequon?
Closer to Cedarburg, dashed lines often mark easements or building lines; read the plat notes.
Can I download parcel lines near Newburg?
Most viewers have a print or export tool, and it's worth keeping the parcel ID visible for land near Thiensville.
Open the official Ozaukee 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.