Wisconsin · FIPS 55055 · County seat: Jefferson
Jefferson County, WI GIS & Parcel Viewer
Looking for lot lines or a parcel number in Jefferson County, WI? The quickest route is the Jefferson County ArcGIS parcel map, the county parcel map we keep on file for this county. We link straight to it and add a few tips for getting around.
Open the Jefferson County parcel map ↗
Opens jeffarcgis.jeffersoncountywi.gov in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Jefferson County ArcGIS parcel map |
|---|---|
| Type | County-run map |
| Website | jeffarcgis.jeffersoncountywi.gov |
| Access | Free, no login (checked Oct 2026) |
| County seat | Jefferson |
| Population | 85,743 (2023 Census Bureau estimate) |
| Land area | 556 sq mi |
| FIPS code | 55055 |
Where the parcel data comes from
This map is published by or for Jefferson County itself, so it reflects the local parcel layer rather than a third-party copy. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Jefferson County viewer
- Open the official link; the viewer runs on Esri's ArcGIS platform.
- Find the search control and type in a street address or parcel ID, or zoom in by hand.
- Click a parcel to see the attributes the publisher shares.
- Use any layer or basemap tools to add aerial imagery or other map layers.
Have a tax bill handy? The parcel or account number on it is usually the fastest way to search.
The county in brief
The U.S. Census Bureau estimated Jefferson County's population at 85,743 in 2023, spread over about 556 square miles of land, or roughly 154 people per square mile. That makes it number 20 out of 72 Wisconsin counties by population. Its county seat is Jefferson.
Nearby parcel maps
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Jefferson County:
Maps vs. surveys
The lines you see online are approximate. They're good for finding a lot and its parcel number, but a legal boundary question needs the recorded plat or a surveyor.