Janesville is a city located in Rock County, Wisconsin. With a 2020 population of 65,149, it is the 10th largest city in Wisconsin and the 588th largest city in the United States. Janesville is currently growing at a rate of 0.45% annually and its population has increased by 2.48% since the most recent census, which recorded a population of 63,575 in 2010. Spanning over 35 miles, Janesville has a population density of 1,913 people per square mile.
The average household income in Janesville is $69,064 with a poverty rate of 12.70%. The median rental costs in recent years comes to $816 per month, and the median house value is $136,300. The median age in Janesville is 39 years, 37.3 years for males, and 41.4 years for females. For every 100 females there are 94.2 males.