Property Tax in Waukesha County, Wisconsin
The median real estate tax bill in Waukesha County, Wisconsin is $4,525 per year, and the median home is worth $373,600. Both figures are the US Census Bureau's survey medians for owner-occupied households (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023).
What the Waukesha County numbers mean
Read the two medians together: $4,525 is the middle tax bill among owner-occupied households in Waukesha County, and $373,600 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 Waukesha County is 1.21% (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.
Waukesha County by the numbers
| Measure | Waukesha County | Wisconsin | United States |
|---|---|---|---|
| Median real estate taxes paid | $4,525 | $3,746 | $2,969 |
| Median home value | $373,600 | $247,400 | $303,400 |
| Derived effective rate* | 1.21% | 1.51% | 0.98% |
| Median tax per month | $377 | $312 | $247 |
*Estimate derived from Census medians (tax ÷ value), not an official rate.
Waukesha County at a glance
- Median tax rank in Wisconsin: #4 of 72 counties
- Median home value rank in Wisconsin: #1 of 72
- Population rank in Wisconsin: #3 of 72 (409,040 residents)
- Population density rank: #2 of 72 (744 people per square mile)
- Land area rank in Wisconsin: #55 of 72 (549 sq mi, 1.0% of the combined county land area)
- Median tax as a monthly figure: $377; per $1,000 of home value: $1.21
How Waukesha County compares
The median tax bill in Waukesha County is about 21% higher than the state median ($3,746 for Wisconsin) and about 52% higher than the US median ($2,969 nationally). By median taxes paid, the county ranks #4 out of 72 Wisconsin counties with published Census data — 3 counties in the state have a higher median bill.
Comparisons cut both ways: a county can have a modest rate but high bills because homes are expensive, or a high rate but modest bills because homes are cheaper. Waukesha County's derived rate of 1.21% sits above the derived US figure of 0.98%.
Some extra context for Waukesha County: the median bill works out to about $377 a month, and the derived rate equals roughly $1,211 of tax per $100,000 of home value. The county is home to 409,040 people — the #3 most populous county in Wisconsin, spread over 549 square miles, a density of about 744 people per square mile. Its median home value, $373,600, ranks #1 among the state's 72 counties with data.
Zooming out: of 3133 counties nationwide with published Census figures, only 162 record a higher median tax bill than Waukesha County — it sits in the top 5% nationally. The county holds roughly 6.9% of Wisconsin's people. Its homes are worth more than the state norm (median $373,600 versus $247,400), and a decade at the derived rate of 1.21% adds up to about 12.11% of the median home's value in tax. The cheapest county in the state, Iron County, medians $1,777 — $2,748 less than Waukesha County per year.
Counties nearest Waukesha County in the Wisconsin ranking
| County | Median tax paid | Median home value | Derived rate* |
|---|---|---|---|
| Ozaukee County, WI | $4,629 | $368,900 | 1.25% |
| Pierce County, WI | $4,552 | $308,600 | 1.48% |
| Milwaukee County, WI | $4,406 | $216,500 | 2.04% |
| St. Croix County, WI | $4,297 | $349,700 | 1.23% |
How the tax is worked out
Think of the final bill as three ingredients: the assessed value of the property, the exemptions subtracted from it, and the combined rate of every district the property sits in. Waukesha County's medians imply a derived rate of 1.21%; applied illustratively, a $400,000 home would owe about $4,844 a year, or around $404 a month spread evenly. Individual properties depart from the illustration in both directions.
Checking your assessment in Waukesha County
Believe your assessment is too high? The practical order of attack is: obtain your record card and audit it line by line; collect comparable recent sales in Waukesha County; ask the assessor's office to correct anything plainly wrong; and, if the value still seems off, lodge a formal appeal ahead of the deadline printed on your assessment notice. Windows are short — often 30 to 90 days — and late appeals are usually rejected outright, however strong the case.
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Frequently asked questions
What is the median property tax in Waukesha County, Wisconsin?
The median real estate tax paid in Waukesha County, Wisconsin is $4,525 per year, on a median home value of $373,600 (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023).
What is the effective property tax rate in Waukesha County, Wisconsin?
On a derived basis, 1.21%: the county's median tax bill of $4,525 divided by its median home value of $373,600. Because it is calculated from two survey medians, read it as a comparison estimate rather than an official rate.
How does Waukesha County compare with the rest of Wisconsin?
By median taxes paid, Waukesha County stands at #4 among the 72 Wisconsin counties the Census publishes figures for. Its $4,525 median bill is about 21% higher than the state median ($3,746), and 3 counties in the state record a higher median.
How are property taxes calculated in Waukesha County, Wisconsin?
Three steps produce the bill: an assessment of market value by the local assessor, a reduction for exemptions you qualify for (a homestead exemption is the common one), and multiplication by the combined rates of the county, municipality, school district and any special districts covering the property. The median result in Waukesha County is $4,525 of tax on a $373,600 median home value.
Can I appeal my property tax assessment in Waukesha County, Wisconsin?
Yes — appeals are handled locally. Start with the Waukesha County assessor's property record card for your home, correct any factual errors, and back your case with comparable recent sales. Formal appeals go to the review board named on your assessment notice and must be filed by its deadline, typically within 30 to 90 days.