Property Tax in Rock County, Wisconsin

What the Rock County numbers mean

Read the two medians together: $3,652 is the middle tax bill among owner-occupied households in Rock County, and $215,900 is the middle home value. Neither figure describes a specific property — together they describe the typical homeowner's situation in the county.

The derived effective rate for Rock County is 1.69% (median tax ÷ median value). Treat it as an estimate for comparison only: it comes from survey medians of different households, not from the county's rate schedule.

The key figures for Rock County

For context, the Wisconsin medians are $3,746 of tax on $247,400 of value, and the US medians are $2,969 on $303,400. *Derived figures are estimates from Census medians, not official rates.

Rock County at a glance

• Median tax rank in Wisconsin: #17 of 72 counties
• Median home value rank in Wisconsin: #32 of 72
• Population rank in Wisconsin: #9 of 72 (163,944 residents)
• Population density rank: #13 of 72 (228 people per square mile)
• Land area rank in Wisconsin: #41 of 72 (718 sq mi, 1.3% of the combined county land area)
• Median tax as a monthly figure: $304; per $1,000 of home value: $1.69

How Rock County compares

Of the 72 Wisconsin counties with published data, 16 have a higher median property tax bill than Rock County's $3,652, putting the county at #17 in the state. Its bill is about the same as the state median of $3,746 and about 23% higher than the national median of $2,969.

Rates and values pull in opposite directions: an expensive housing market can produce big bills at ordinary rates. Here the derived rate is 1.69%, versus 0.98% derived nationally, and the median home value ranks #32 within Wisconsin.

Some extra context for Rock County: the median bill works out to about $304 a month, and the derived rate equals roughly $1,692 of tax per $100,000 of home value. The county is home to 163,944 people — the #9 most populous county in Wisconsin, spread over 718 square miles, a density of about 228 people per square mile. Its median home value, $215,900, ranks #32 among the state's 72 counties with data.

Zooming out: of 3133 counties nationwide with published Census figures, only 277 record a higher median tax bill than Rock County — it sits in the top 9% nationally. The county holds roughly 2.8% of Wisconsin's people. Its homes are worth less than the state norm (median $215,900 versus $247,400), and a decade at the derived rate of 1.69% adds up to about 16.92% of the median home's value in tax. The cheapest county in the state, Iron County, medians $1,777 — $1,875 less than Rock County per year.

Counties nearest Rock County in the Wisconsin ranking

Rock County and its population peers

Counties of a similar size can tax very differently. The table below shows the counties closest to Rock County in population across the United States, with their median bills and home values. Within the group of 9, Rock County ($3,652) ranks the highest by median tax paid.

The closest population match is Johnson County, Indiana (163,983 residents), where the median real estate tax paid is $1,875 on a median home value of $260,400 — $1,777 more than Rock County pays.

Staying within Wisconsin, the counties nearest Rock County by population are Winnebago County (171,357 residents, median tax $3,573 on a median value of $208,600); Kenosha County (168,413 residents, median tax $4,180 on a median value of $247,800); Marathon County (138,067 residents, median tax $3,108 on a median value of $205,500); Washington County (137,320 residents, median tax $3,795 on a median value of $316,200). The spread in their median bills — all under the same state framework — shows how much of the property tax burden is decided county by county and district by district.

How the tax is worked out

As an illustration of the arithmetic: at Rock County's derived rate of 1.69%, a home valued at $400,000 would carry a tax bill of roughly $6,768 a year. That is only an illustration using the derived rate — a real bill is computed from the property's assessed value, its exemptions, and the combined rates of its specific taxing districts, so it can be higher or lower.

The usual sequence is: the local assessor values the property; exemptions are applied; the taxable value is multiplied by the combined local rates; and the county bills and collects the tax, distributing it to the schools, municipalities and districts that levied it.

Illustrative bills in Rock County at the derived rate

The derived rate of 1.69% is only an estimate built from medians, but applying it to different home values gives a sense of scale for Rock County — and a quick way to compare with the state derived rate of 1.51% and the US figure of 0.98%:

Illustration only: real bills are computed from the assessed value, exemptions, and the combined rates of the property's actual taxing districts.

Checking your assessment in Rock County

Most successful appeals are won on facts, not arguments. Start with the property record card held by the Rock County assessor: wrong square footage, an extra room, or a missing homestead exemption are common and fixable. Next, line your assessed value up against recent sales of genuinely similar homes nearby. Many disputes end at an informal conversation with the assessor's office; if yours does not, file the formal appeal with the review board named on your notice before its deadline, evidence attached, and keep paying the bill in the meantime so penalties do not build up.

More Wisconsin counties

• Kenosha County, WI — $4,180
• Winnebago County, WI — $3,573
• Marathon County, WI — $3,108
• Washington County, WI — $3,795
• Outagamie County, WI — $3,580
• Racine County, WI — $4,071

Frequently asked questions