In 2018, Rock County, WI had a population of 162k people with a median age of 39.5 and a median household income of $55,832. Between 2017 and 2018 the population of Rock County, WI grew from 161,226 to 161,769, a 0.337% increase and its median household income grew from $53,410 to $55,832, a 4.53% increase.
The 5 largest ethnic groups in Rock County, WI are White (Non-Hispanic) (83.1%), White (Hispanic) (5.05%), Black or African American (Non-Hispanic) (4.32%), Other (Hispanic) (2.66%), and Two+ (Non-Hispanic) (2.6%). 0% of the households in Rock County, WI speak a non-English language at home as their primary language, and 97.4% of the residents in Rock County, WI are U.S. citizens.
In 2018, the median property value in Rock County, WI was $139,800, and the homeownership rate was 68%. Most people in Rock County, WI drove alone to work, and the average commute time was 22 minutes. The average car ownership in Rock County, WI was 2 cars per household.