Janesville, Wisconsin

Janesville, Wisconsin
Town Square in downtown Janesville
Nickname(s): 
Wisconsin's Park Place, Bower City
Interactive map of Janesville, Wisconsin
Janesville
Janesville
Coordinates: 42°41′05″N 89°00′47″W / 42.684698°N 89.013170°W / 42.684698; -89.013170
CountryUnited States
StateWisconsin
CountyRock
Established1835
IncorporatedApril 12, 1853
Founded byHenry Janes
Government
 • City ManagerKevin Lahner
 • PresidentsAaron Burdick
Larry Squire
 • CouncilmembersMichael Cass
Joshua Erdman
Heather Miller
Richard Neeno
Paul Williams
Area
 • City
35.246 sq mi (91.287 km2)
 • Land34.645 sq mi (89.729 km2)
 • Water0.602 sq mi (1.558 km2)  1.71%
Elevation
850 ft (259 m)
Population
 (2020)
 • City
65,615
 • Estimate 
(2024)
66,428
 • RankUS: 592nd
WI: 10th
 • Density1,893.9/sq mi (731.26/km2)
 • Urban
72,285 (US: 392nd)
 • Urban density1,972/sq mi (761.5/km2)
 • Metro
165,461 (US: 265th)
 • Combined
939,553 (US: 64th)
DemonymJanesvilleites
Time zoneUTC–6 (Central (CST))
 • Summer (DST)UTC–5 (CDT)
ZIP Codes
53545, 53546, 53547, 53548
Area codes608 and 353
FIPS code55-37825
GNIS feature ID1583448
Websitejanesvillewi.gov

Janesville is a city in and the county seat of Rock County, Wisconsin, United States. The population was 65,615 at the 2020 census, and was estimated at 66,428 in 2024, making it the tenth-most populous city in Wisconsin. The Janesville–Beloit Metropolitan statistical area, consisting solely of Rock County, has an estimated 165,461 residents in the 2024 estimate. It is located along the Rock River in southern Wisconsin.