Janesville Flag

Janesville

County:
Rock County
County Seat:
Yes
Area (mi²):
34.644
State:
Wisconsin

Janesville is a city located in Rock County, Wisconsin. Janesville has a 2026 population of 66,428. It is also the county seat of Rock County. Janesville is currently growing at a rate of 0.45% annually and its population has increased by 1.18% since the most recent census, which recorded a population of 65,651 in 2020.

66.4K
Total Population
1,917
Density (mi²)
298 0.45%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)