Wisconsin · FIPS 55139 · County seat: Oshkosh
Winnebago County, WI GIS & Parcel Viewer
Parcel lookups for Winnebago County start at the Winnebago County parcel map. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Winnebago County parcel map ↗
Opens wcgis3.co.winnebago.wi.us in a new tab. We link out and never embed or copy parcel data.
Winnebago County at a glance
| Official map | Winnebago County parcel map |
|---|---|
| Type | County-run map |
| Website | wcgis3.co.winnebago.wi.us |
| Access | Free, no login (checked Oct 2026) |
| County seat | Oshkosh |
| Population | 171,735 (2023 Census Bureau estimate) |
| Land area | 435 sq mi |
| FIPS code | 55139 |
Where the parcel data comes from
This map is published by or for Winnebago County itself, so it reflects the local parcel layer rather than a third-party copy. Our October 2026 check found the map open to the public, with no account or payment needed.
How to use the Winnebago County viewer
- Open the official link in a new tab.
- Accept any disclaimer, then look for a search box that takes street addresses, owners or parcel IDs.
- Zoom in and click a parcel to see its details.
- Use the map's layer controls to add aerials or other layers if they're offered.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
Winnebago County by the numbers
Census Bureau figures put Winnebago County at about 171,735 people (2023 estimate) on roughly 435 square miles of land, which is about 395 residents per square mile. Among Wisconsin's 72 counties, it is the 7th largest by population. Census maps also count about 144 square miles of water inside its boundary. Its county seat is Oshkosh.
Neighboring counties
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Winnebago County:
- Calumet County
- Fond du Lac County
- Green Lake County (state list)
- Outagamie County
- Waupaca County (state list)
- Waushara County
Before you rely on the lines
Treat the map as a guide, not a boundary survey: parcel outlines are often shifted a bit from the real corners. A licensed surveyor settles exact lines.