Blog · October 14, 2026 · Wisconsin
Using the Grafton Zoning Map
Zoning decides what can be built where, and the answer for a lot near Mequon starts with the right map.
Main page: Ozaukee County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Ahead of any building plan near Thiensville, check the Grafton zoning map early: a district label decides setbacks, lot size and uses. What this Grafton guide covers: who controls zoning for a given parcel, matching a lot to its zoning district, and what to ask the planning staff.
Reading the Grafton zoning map for one lot
Within municipal limits, zoning usually comes from the municipality, so a lot in Grafton follows that code. Outside those limits, near Mequon or Cedarburg, the county's ordinance, if any, takes over; ask the county planning office to be sure. To find out which side of the line a parcel is on: look for a city limits layer in the Ozaukee County parcel viewer.
The viewer Ozaukee County publishes
Lots and tracts near Thiensville are published on the Ozaukee County parcel viewer, which opens without registering. For a tract near Thiensville, enter a street address, an owner's name or a parcel number, and the viewer zooms to the match. In and around Newburg, the parcel card typically gives the owner of record, acreage on the tax roll, the parcel number and in many cases the last transfer.
Reading the legal description
Wisconsin is laid out under the Public Land Survey System, so deeds around Mequon reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though real sections near Mequon vary in size. Copy the legal description from the record for the parcel near Port Washington for any title or survey request.
When a parcel crosses a boundary
Ozaukee County borders Muskegon County, MI, Oceana County, MI, Milwaukee County, Sheboygan County, and Washington County; every one of them runs a separate parcel map. Ground near Port Washington that runs to the line can show up across two assessors' files, so look at the adjacent map as well. With a lot near Mequon, our state page links each neighboring county map across Wisconsin.
Field tips
Most viewers work in a phone browser, handy when you're parked on a road near Thiensville, though signal can drop in rural spots. A screenshot of the parcel near Cedarburg with its ID is a good backup.
Deeds, plats and who keeps them
The map is an index, not the title: deeds, subdivision plats and easements covering ground around Mequon are filed with the Register of Deeds. For land near Port Washington, have ready the book and page listed on the parcel record and the lookup takes minutes.
A quick look at the area
Port Washington holds the county offices, which is where the courthouse records live. You'll also find Cedarburg, Saukville, and Thiensville. Around 93,460 people live in Ozaukee County (Census estimate, 2023) on about 233 square miles. Ozaukee County was formed in 1853, and some chains of title near Port Washington are long. Features like Lake Michigan and Lion's Den Gorge Nature Preserve are easy to spot when you zoom out from Thiensville.
What to ask before you buy
When you call about land near Cedarburg, give the parcel number and your intended use; staff can point to the right section of the ordinance. Ask whether a parcel near Mequon meets current minimum size, since some older splits don't.
Permits after zoning
Once zoning clears a project near Port Washington, you still need building permits and inspections; health and road departments may weigh in on land near Newburg.
Where Grafton fits in
Grafton is part of Ozaukee County, Wisconsin, so its parcels are on the county's map. In and around Port Washington, the municipality handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Lots just outside the city limits out by Saukville often follows county rules rather than the town's.
Reading the district label
Look up the lot on the Ozaukee County parcel viewer first, note the parcel number, and use it when you ask the planning office near Cedarburg. If you're looking near Newburg, district codes like R-1, C-2 or A-1 aren't self-explanatory, so read the ordinance chapter for each; the letters vary from place to place.
Reading the ordinance
Closer to Newburg, the ordinance spells out uses allowed by right, uses needing a permit, and uses not allowed. For a tract near Newburg, overlay districts, whether historic, floodplain or corridor, may apply even when the base zoning looks simple.
Variances and rezoning
For a tract near Saukville, most of these involve time, so budget weeks or months before you close.
Quick answers
Can covenants be stricter than zoning near Mequon?
For most people, recorded restrictions in Grafton can be stricter than zoning, so follow whichever is stricter.
Is land outside Grafton zoned?
In most cases, county rules near Port Washington vary, so ask the county planning office.
How can I look up zoning in Grafton?
For most people, find the parcel near Saukville on the county parcel viewer, confirm whether it's inside Grafton limits, then ask that planning office for the district.
How do variances work near Thiensville?
Usually, boards in Grafton grant variances only when strict rules cause a real hardship.
What's a legal description around Mequon?
With a lot near Thiensville, Deeds use lot and block, metes and bounds or survey descriptions, and the parcel record often summarizes it.
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.