Rock County Wisconsin Property Appraiser, Search Your Record Lookup
Rock County, Wisconsin maintains 71,734 active parcels across its municipalities, including the cities of Janesville and Beloit — the county's two largest urban centers. Our free search tool gives you instant access to ownership records, assessed values, tax history and parcel details no account or login needed.
Wisconsin Property Search
Rock County, Wisconsin’s Property Appraiser office maintains and updates detailed parcel data for public access. The county currently manages 71,734 parcels and 101,148 matched buildings, supported by aerial imagery collected between 2018 and 2022. Address datasets were refreshed recently, identifying 82,089 secondary addresses. In addition, zoning data has been standardized across 70,941 parcels, ensuring reliable property assessments, accurate parcel mapping, and updated tax roll records for the region.
Rock County Wisconsin Property Overview – 2026
Rock County contains 57,997 residential properties and 2,148 commercial properties. The average single-family home is 61 years old with 1,558 sq. ft. In 2026, there were 384 residential sales, while 0.83% of homes are seriously underwater, and the effective property tax rate is 1.26%.
Residential Properties
57,997
Commercial Properties
Avg. Home Age Single Family
Avg. Square Feet Single Family
Residential Sales 2026
Homes Seriously Underwater
Residential Sales past year
Rich Homes percentage
38.71%
Effective 2026 Property Tax
Total Foreclosure Filings 2025
12
Near By Counties In Rock County
Rock County — Janesville's Reinvention After the GM Era
The General Motors Janesville Assembly Plant operated from 1923 until December 23, 2008 — the last GM plant in the United States to close during the financial crisis, producing full-size SUVs until the final day. At its peak, the plant employed over 7,000 workers and anchored Rock County's industrial economy for 85 years. The plant's closure reshaped Janesville's property market: home values dipped significantly in 2009-2012 before recovering as the city diversified into healthcare, education, and distribution sectors. Today Rock County's median home value of $271,000 sits near the Wisconsin state average with 114 residential sales recorded in 2026. The county's 1.87% effective tax rate — the highest among Wisconsin's southern border counties — reflects Janesville's urban service infrastructure. Rock County was also the hometown of Paul Ryan, who served as Speaker of the U.S. House of Representatives from 2015 to 2019. The county borders Illinois along its entire southern edge, with the Rock River flowing north through Janesville from Illinois before joining the Mississippi.
Rock County vs Southern Wisconsin Border Counties — Tax Rate
Effective tax rate — Rock County carries the highest rate among southern border counties
Top Cities in Rock County Wisconsin
The leading cities in Rock County Wisconsin include Janesville, Beloit, and Edgerton, which serve as major residential and commercial centers. These areas feature a blend of established neighborhoods, new developments, and active communities. They play an important role in property valuation, zoning regulation, and maintaining parcel data managed by the county’s Property Appraiser office.
Janesville
36,842 Parcels
Beloit
24,615 Parcels
Edgerton
3,904 Parcels
View Rock County Parcel Map — Official GIS
Search Rock County parcel boundaries, Rock River corridor properties, and ownership data on the official Rock County land records and GIS mapping system
Open Rock County GIS Map →Also: Wisconsin Statewide Parcel Map (all 72 counties)
Helpful for Rock County Property Research
Rock County Wisconsin Property Search Tool Has 4 Best Methods
Our Rock County Wisconsin Property Search Tool allows users to quickly access property records online at no cost. You can search using owner name, parcel number (PIN), property address, or city name. The tool provides instant access to ownership data, tax records, sales history, and full property details within seconds.
Search By Owner Name
Use the owner’s name to locate property records within Rock County Wisconsin.
Search By Address
Search property details using a physical address in Rock County Wisconsin easily.
Search By Parcel PIN
Enter the parcel number for precise property lookup in Rock County Wisconsin.
Search By City Name
If no details are available, search using city name within Rock County Wisconsin.
Rock County Wisconsin Property Search Tool Provide Information
Our Rock County Wisconsin Property Search Tool offers complete property insights for every search. By using owner name, parcel number, or address, users can access ownership records, tax details, land values, and official county assessment data for accurate and reliable real estate analysis.
Parcel Number
Primary legal owner name recorded in Rock County Wisconsin property records for ownership verification purposes
Owner Name
Secondary owner name listed in Rock County Wisconsin records identifying co-owners and shared property responsibilities
Site Address
Physical property location in Rock County Wisconsin essential for mapping, navigation, and real estate identification
Postal Address
Mailing address of property owner in Rock County Wisconsin used for official tax communication delivery
PI Number
Unique parcel identification number assigned in Rock County Wisconsin for tracking property records and legal documentation
Tax Parcel Id
Tax parcel number used in Rock County Wisconsin to connect properties with taxation and assessment records
State Id
State level identification number for properties within Rock County Wisconsin ensuring consistent record tracking across databases
Zip Code
Zip code of property in Rock County Wisconsin used for location analysis and regional property evaluation
Place Name
City or place name in Rock County Wisconsin identifying property location for mapping and real estate research
School District
School district assigned in Rock County Wisconsin influencing property values, taxes, and education related decisions
Assessed Value
Assessed property value determined by Rock County Wisconsin for taxation and real estate market comparison purposes
Land Value
Land value assessed separately in Rock County Wisconsin important for investment analysis and taxation calculations
Improvement Value
Improvement value in Rock County Wisconsin representing buildings and structures used in property tax calculation
Fair Market Value
Estimated market value of property in Rock County Wisconsin guiding buyers and sellers in pricing decisions
Property Tax Amount
Net property tax amount in Rock County Wisconsin after deductions important for financial and tax planning
Gross Property Tax
Total gross property tax in Rock County Wisconsin before exemptions showing full financial obligations clearly
Property Class
Property classification in Rock County Wisconsin such as residential or commercial used for valuation and taxation
Assessed Acres
Assessed acreage in Rock County Wisconsin used for taxation, valuation, and understanding total land size
Deeded Acres
Deeded acreage recorded in Rock County Wisconsin representing legal land ownership area for official documentation
GIS Acres
GIS calculated acreage in Rock County Wisconsin providing precise land measurements for mapping and planning purposes
$259,683
FAQs
How can I search property records in Rock County Wisconsin?
You can search using owner name, parcel number, address, or city through the online property tool.
What is a Parcel Identification Number in Rock County Wisconsin?
It is a unique number assigned to each property for tracking records, taxes, and legal documentation.
Are Rock County Wisconsin property records available online for free?
Yes, most property records can be accessed online at no cost through the county search system.
What details are included in Rock County Wisconsin property records?
Records include ownership information, tax data, property value, sales history, and parcel details.
How often is property data updated in Rock County Wisconsin?
Property records are updated regularly based on new assessments, sales data, and official county updates.