All Rock County population data above are from the US Census Bureau.
With 161,620 people, Rock County is the 9th most populated county in the state of Wisconsin out of 72 counties. But watch out, Rock County, because Marathon County with 135,603 people and Washington County with 134,296 people are right behind you.
The largest Rock County racial/ethnic groups are White (83.8%) followed by Hispanic (8.1%) and Black (3.4%).
In 2015, the median household income of Rock County residents was $50,324. Rock County households made slightly more than Buffalo County households ($50,196) and Dunn County households ($49,788) . However, 15.0% of Rock County residents live in poverty.
The median age for Rock County residents is 38.9 years young.
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The population data for Rock County are from the Census 2000, Census 2010, the Census' American Community Survey 2015 5-year estimates and the Census' 2016 Population Estimates. The demographic data for Buffalo County, Dunn County, Marathon County, and Washington County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2015 5-year estimates, and were downloaded on December 2016. Check out our FAQ section for more details.
The District of Columbia Starter Report, shown on the left, will give you a good idea of what to expect in a Starter Report. The Rock County, WI report will have the same data, charts & graphs as this sample.
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