Wisconsin · FIPS 55105 · County seat: Janesville
Rock County, WI GIS & Parcel Viewer
Use this page to reach the official county parcel map for Rock County, Wisconsin. The button below opens Land Records for Rock County in a new tab, so you can look up parcels by address, owner or parcel number on the source site itself.
Open the Rock County parcel map ↗
Opens arcgis.com in a new tab. We link out and never embed or copy parcel data.
Quick facts
| Official map | Land Records for Rock County |
|---|---|
| Type | County-run map |
| Website | arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Janesville |
| Population | 164,278 (2023 Census Bureau estimate) |
| Land area | 718 sq mi |
| FIPS code | 55105 |
Who runs this map
This map is published by or for Rock 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.
Searching for a parcel, step by step
- Open the link. It is an ArcGIS Instant App, a simple Esri template with a map and a few tools.
- Use the search box to jump to an address or place.
- Click a parcel to open its pop-up.
- Look for buttons along the edge of the map for layers, legend or basemaps.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
The county in brief
Census Bureau figures put Rock County at about 164,278 people (2023 estimate) on roughly 718 square miles of land, which is about 229 residents per square mile. By population it ranks 9th of 72 counties in Wisconsin. Janesville serves as the county seat.
Neighboring counties
Parcels close to the edge of Rock County can fall in the next county over. Neighboring counties:
- Dane County
- Green County (state list)
- Jefferson County
- Walworth County
- Boone County, IL
- Winnebago County, IL
Maps vs. surveys
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.