Rock County, Wisconsin Demographics 2026
Rock County, Wisconsin has a population of 164,350, the 9th most populous county in Wisconsin. The median household income is $75,673 and the median home value is $231,600. The poverty rate is 9.3%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Rock County Quick Facts
How Rock County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 163,944 | 164,350 | +0.2% |
| Median household income | $74,390 | $75,673 | +1.7% |
| Median home value | $215,900 | $231,600 | +7.3% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 37 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Rock County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Janesville | 66,030 | $73,446 | 9.0% | $223,400 |
| Beloit | 36,534 | $62,663 | 15.0% | $156,500 |
| Evansville | 5,782 | $81,149 | 5.6% | $276,400 |
| Milton | 5,706 | $85,959 | 6.5% | $249,200 |
| Brodhead | 3,197 | $49,583 | 14.9% | $168,800 |
| Clinton | 2,041 | $72,019 | 5.9% | $209,400 |
| Orfordville | 1,473 | $65,417 | 8.8% | $194,900 |
| Footville | 908 | $68,571 | 11.6% | $160,800 |
| Hanover | 130 | $60,972 | 3.9% | $150,000 |
| Shopiere | 123 | N/A | 0.0% | $245,800 |
| Fulton | 31 | N/A | 48.4% | N/A |
Explore Wisconsin Rankings
Population Overview
Rock County is located in Wisconsin with a total population of 164,350. It is the 9th most populous county out of 72 in Wisconsin. The county encompasses 11 Census-designated places.
Age Demographics
The median age in Rock County is 40.3 years. This is about the same as the state median of 40.2 years.
Economy, Income & Housing
The median household income in Rock County is $75,673. This is 2% lower than the state median of $77,485. It is also 6% lower than the national median of $80,734. The poverty rate stands at 9.3%. This is 12% lower than the state poverty rate of 10.5%. The unemployment rate is 3.8%. This is 16% higher than the state rate of 3.3%. The median home value is $231,600. Housing costs are 13% lower than the state median of $266,500. The home-value-to-income ratio is 3.1x. 71.2% of occupied housing units are owner-occupied. This homeownership rate is 5% higher than the state average of 67.8%.
Race & Ethnicity
The largest racial or ethnic group in Rock County is White (non-Hispanic), making up 79.6% of the population. Hispanic or Latino residents account for 10.1%. The Asian population (1.1%) is well below the state average of 2.9%.
Education
25.8% of residents aged 25 and older hold a bachelor's degree or higher. This is 23% lower than the state rate of 33.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.6%.
Data Sources & Methodology
All figures for Rock County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Wisconsin and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Rock County, Wisconsin?
Rock County has a population of 164,350, making it the 9th most populous county in Wisconsin.
What is the median income in Rock County?
The median household income in Rock County is $75,673 with a poverty rate of 9.3%.
How many cities are in Rock County, Wisconsin?
Rock County contains 11 Census-designated places.