Blog · October 14, 2026 · Wisconsin
Grafton GIS Map: looking up parcels
Parcel data for Grafton comes from the county, and the viewer is free.
Main page: Ozaukee County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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When land near Thiensville catches your eye, the Grafton GIS map lays out lines, owner names and parcel numbers. What this Grafton guide covers: where that map lives, how to search it, and the limits worth knowing.
The official viewer behind the Grafton GIS map
Some cities also run their own GIS portal for utilities or zoning; ask city hall in Grafton whether one exists.
The viewer Ozaukee County publishes
Parcels around Newburg appear on the Ozaukee County parcel viewer, which opens without registering. For property near Saukville, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. Closer to Port Washington, the record panel normally shows the owner of record, acreage on the tax roll, a parcel ID and sometimes recent sales.
Grafton, WI: the basics
Grafton sits in Ozaukee County, Wisconsin, which means parcel data comes from the county. On ground around Saukville, city or town hall handles matters such as zoning, permits and utilities within town limits, while the county keeps the tax map. Acreage past the city limits near Mequon usually falls under county rules instead.
Three ways to find a parcel
By address works best for lots in Grafton; owner search often wants the surname first. If the land is near Mequon, searching by parcel number never misses, and you'll find it on tax statements.
Legal descriptions in Wisconsin
Wisconsin follows the Public Land Survey System, which means a tract near Thiensville is described by section, township and range. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though real sections near Newburg vary in size. Copy the legal description from the record for the parcel near Thiensville for any title or survey request.
When the map won't load
When the map won't open around Mequon, switch browsers or turn off pop-up blockers; the Platbookmapper county page tracks the current link.
When a parcel crosses a boundary
Ozaukee County meets Muskegon County, MI, Oceana County, MI, Milwaukee County, Sheboygan County, and Washington County, all with their own assessor records. Ground near Port Washington that runs to the line may be split across two assessors' files, so check the neighboring map before you assume the acreage. Out toward Newburg, our state page lists each bordering county map for Wisconsin.
Beyond the parcel lines
On ground around Port Washington, look in the layer list for city limits, flood hazard, zoning or soils; availability varies.
Printing and saving
Print or screenshot the parcel near Thiensville with its ID visible, so you have it when calling an office.
Places you'll see on the map
Port Washington serves as the county seat, which is where the courthouse records live. Smaller places on the map include Cedarburg, Saukville, and Thiensville. Around 93,460 people live in Ozaukee County (Census Bureau estimate, 2023) across roughly 233 square miles. Ozaukee County was formed in 1853, and some chains of title near Newburg are long. Landmarks such as Lake Michigan and Lion's Den Gorge Nature Preserve help you orient on the aerial around Mequon.
Taking the map into the field
Most viewers work in a phone browser, which helps when you're standing on land near Mequon, but coverage can be spotty out of town. A printout of the tract near Mequon is a good backup.
Offices that can help
If the acreage or value on a parcel near Mequon looks off are handled by the county real property listing office, since that office keeps the assessment data. Zoning, permits and septic questions near Port Washington need the planning or permitting office, town or county, depending on location.
Limits of the parcel data
Acreage on the record is an estimate; only a licensed surveyor can set the real corners for a parcel near Thiensville. Out toward Mequon, records update in batches, so a deed recorded last month might lag behind.
What the record panel tells you
Recent sales on nearby lots around Saukville give a rough idea of values; an appraiser is the real authority.
The paper trail behind a parcel
When the details count, get the recorded deed through the Register of Deeds; the parcel map near Newburg only summarizes it. Older tracts around Port Washington may trace back through several deeds, and a title company is worth hiring before a purchase.
Frequently asked
How current is the parcel data for land near Mequon?
Usually, updates come in batches.
Is the Grafton GIS map free?
The county viewer covering Grafton needs no account, though printing may be limited.
How do I find who owns a lot near Thiensville?
Good question; click the lot near Thiensville to see the owner, or search by address instead.
What layers does the parcel viewer have around Newburg?
In and around Thiensville, many viewers offer aerial imagery plus layers like city limits, zoning or flood zones; availability varies.
What's the tax parcel number used for in Grafton?
It's the number the county real property listing office uses to track a tract near Newburg, and it's on the record panel and tax bills.
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.