Rock County, Wisconsin Demographics 2026
Rock County, Wisconsin has a population of 163,944, the 9th most populous county in Wisconsin. The median household income is $74,390 and the median home value is $215,900. The poverty rate is 10.0%.
Rock County Quick Facts
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
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: 36 | National average: 60
Education
Educational Attainment (Adults 25+)
Cities & Places in Rock County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Janesville city | 65,813 | $71,664 | 9.6% | $209,700 |
| Beloit city | 36,554 | $59,975 | 16.8% | $133,500 |
| Edgerton city | 5,924 | $84,185 | 6.0% | $243,900 |
| Evansville city | 5,771 | $78,841 | 6.4% | $256,900 |
| Milton city | 5,685 | $84,648 | 4.3% | $210,500 |
| Brodhead city | 3,205 | $49,531 | 16.2% | $167,600 |
| Clinton village | 2,034 | $68,571 | 5.9% | $172,300 |
| Orfordville village | 1,567 | $77,500 | 8.8% | $176,300 |
| Footville village | 876 | $57,063 | 9.7% | $150,400 |
Explore Wisconsin Rankings
Population Overview
Rock County is located in Wisconsin with a total population of 163,944. It is the 9th most populous county out of 72 in Wisconsin. The county encompasses 9 Census-designated places.
Age Demographics
The median age in Rock County is 40.1 years. This is about average than the state median of 40.1 years.
Economy, Income & Housing
The median household income in Rock County is $74,390. This is 2% lower than the state median of $75,670. Compared to the national median of $78,538, household income here is 5% lower. The poverty rate stands at 10.0%. This is 6% lower than the state poverty rate of 10.6%. The unemployment rate is 4.0%. This is 20% higher than the state rate of 3.3%. The median home value is $215,900. Housing costs are 13% lower than the state median of $247,400. With a home-value-to-income ratio of just 2.9x, Rock County is one of the most affordable housing markets in the area. 70.6% of occupied housing units are owner-occupied. This homeownership rate is 4% higher than the state average of 67.9%.
Race & Ethnicity
The largest racial or ethnic group in Rock County is White (non-Hispanic), making up 80.2% of the population. Hispanic or Latino residents account for 9.9%. The Asian population (1.1%) is well below the state average of 2.9%.
Education
25.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 21% lower than the state rate of 32.8%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.6%.
Frequently Asked Questions
What is the population of Rock County, Wisconsin?
Rock County has a population of 163,944, 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 $74,390 with a poverty rate of 10.0%.
How many cities are in Rock County, Wisconsin?
Rock County contains 9 Census-designated places.