Property Tax & Income in Rock County, Wisconsin
Rock County has an effective property tax rate of 1.60%. On the median home value of $231,600, that's roughly $3,703 per year. Median household income is $75,673.
What you'll pay, at a glance
Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.
| Metric | Rock County | Wisconsin (state context) |
|---|---|---|
| Effective property tax rate1 | 1.60% | 1.36% |
| Median home value1 | $231,600 | — |
| State income tax3 | top rate 7.65% | top rate 7.65% |
| State sales tax3 | 5.72% combined | 5.72% combined |
How this is calculated
The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.
About Rock County, WI
Rock County's 1.599% effective property tax rate sits well above Wisconsin's 1.362% statewide median, and it ranks seventh among the state's 72 counties — a notably heavy rate by state standards. That rate also towers over the national median of 0.794%. Still, the tax bill itself depends heavily on what you buy: with a median home value of $231,600, the median annual real-estate tax comes to $3,703. Buyers around Janesville, the county's largest city, can weigh that against a median household income of $75,673 and per-capita income of $38,536. The result is a market where homes cost less than in many parts of the country, but the tax rate runs high, so a comparable house here can carry a larger annual bill than the same price would elsewhere.