WISCONSIN COUNTY PARCEL MAPS
Rock County parcel map and property owners
WI 2026 puts all 73,143 parcels in Rock County on your phone: owner names, site addresses, assessed values and acreage from the county’s 2025 tax roll. The county download is about 22 MB, and once it’s on your phone you can search it and tap any parcel with no signal.
The parcels cover 470,141 mapped acres across 29 towns, villages and cities, and 15 school districts. The most parcels are in the City of Janesville. The data is the State Cartographer’s Office V12 statewide parcel map, loaded from the county on March 5, 2026.
- Agricultural
- Productive forest
- Undeveloped / ag forest
- Residential
- Commercial / manufacturing
- Government-owned / county forest
- Other / unclassified
What the Rock County records include
Counties fill in the statewide schema differently. This is how complete Rock County’s 2025 records are:
| Field | Filled in |
|---|---|
| Owner name | 100% of parcels |
| Site (street) address | 88.7% of parcels |
| Assessed or estimated value | 95.8% of parcels |
| Assessed or deeded acres | 98.3% of parcels |
| Net property tax | 95.8% of parcels |
How the land is classed
By mapped area, Rock County is agricultural 63%, residential 21%, government-owned / county forest 6%, commercial / manufacturing 4%. The median estimated fair market value of a residential parcel is $236,000, across 57,804 residential parcels with a value.
In WI 2026, open the legend and color the map by Class of Property to see the same picture, or by Estimated Fair Market Value to see where values rise and fall.
Deer season: public land and Managed Forest Law
The tax roll marks parcels that are government-owned or enrolled in Wisconsin’s forest tax programs. In Rock County:
- Federal-owned: 445 acres in 19 parcels
- State-owned: 10,833 acres in 233 parcels
- County-owned: 3,153 acres in 123 parcels
- Managed Forest Law, open to public hunting, fishing, hiking, sightseeing and cross-country skiing: 163 acres in 3 parcels
- Managed Forest Law, closed (no public access without permission): 3,375 acres
In WI 2026, color the map by Auxiliary Class of Property to see these parcels, and tap one for the owner and acreage. The acreages are whole-parcel areas from the tax roll: a parcel that is only partly enrolled counts in full, and the tax roll doesn’t show posted areas or access routes. Before you hunt, check the DNR’s map of private forest land open to the public and the signs on the ground.
Towns, villages and cities in Rock County
Every parcel carries its municipality, so you can search a town name in WI 2026 or filter the attribute table to one place. Parcel counts in the 2025 data:
- City of Janesville 25,263
- City of Beloit 13,489
- Town of Beloit 4,306
- Town of Fulton 2,907
- City of Milton 2,560
- City of Evansville 2,509
- City of Edgerton 2,460
- Town of Milton 2,095
- Town of Janesville 2,048
- Town of Turtle 1,569
- Town of Rock 1,422
- Town of Harmony 1,306
- Town of Union 1,038
- Village of Clinton 1,011
- Town of Newark 923
- Town of Plymouth 796
- Town of Center 721
- Town of Porter 712
- Village of Orfordville 707
- Town of Lima 674
- Town of Clinton 666
- Town of Bradford 661
- Town of Johnstown 610
- Town of Spring Valley 572
- Town of la Prairie 570
- Town of Magnolia 537
- Town of Avon 505
- Village of Footville 395
- City of Brodhead 96
Working near the county line?
Rock County borders Dane County, Green County, Jefferson County and Walworth County. Download the neighboring counties too, and WI 2026 searches across all of them at once.
Where the data comes from
Parcel data is the Wisconsin Statewide Parcel Map Database (V12), a public-domain product of the Wisconsin Land Information Program and the State Cartographer’s Office, UW–Madison, built from Rock County’s 2025 tax roll. It is a snapshot, not a live feed: for a sale, a survey or a tax question, check with Rock County directly.