Browse / United States / Wisconsin / Janesville
Janesville
Wisconsincity
Janesville
Total population
66,434
Median home value
$253,000
Bachelor's+
Median income
$66,853
Demographic figures from US Census Bureau · ACS 5-year estimates. Overview below cites Wikipedia and may reference a different year.
- Freeze Warning · SevereFreeze Warning issued October 16 at 12:13PM CDT until October 17 at 9:00AM CDT by NWS Milwaukee/Sullivan WI
Source: NOAA National Weather Service.
City facts
Overview
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.
Read more on WikipediaHistory & geography
History
The area that became Janesville was the site of a Ho-Chunk village named (Round Rock) up to the time of Euro-American settlement. In the 1825 Treaty of Prairie du Chien, the United States recognized the portion of the present city that lies west of the Rock River as Ho-Chunk territory, while the area east of the river was recognized as Potawatomi land. Following the Indian Removal Act of 1830 and the Black Hawk War of 1832, both nations were forced to surrender this land to the United States. American settlers John Inman, George Follmer, Joshua Holmes, and William Holmes Jr. built a crude log cabin in the region in 1835. Later that year, one key settler, Henry F. Janes, Despite being named after a Virginian, Janesville was founded by old stock Yankee immigrants, descended from the English Puritans who settled New England in the 1600s. The completion of the Erie Canal caused a surge in New Englander immigration to what was then the Northwest Territory. Some of them were from upstate New York, and had parents who had moved to that region from New England shortly after the Revolutionary War. New Englanders, and New England transplants from upstate New York, were the vast majority of Janesville's inhabitants during the first several decades of its history. Land surveys encouraged pioneers to settle in the area among the abundance of fertile farmland and woodlands. Many of these early settlers established farms and began cultivating wheat and other grains. Some of the key settlers hailed from the burned-over district of western New York State, (an area notable for being a part of the Christian revival movement known as the Second Great Awakening). Some of those in that revival movement were also active in the abolitionist and women's rights movements. After the Civil…
Geography
According to the United States Census Bureau, the city has a total area of , of which is land and (1.71%) is water.
Excerpted from the corresponding Wikipedia article (CC BY-SA).
Demographics & economy
Race & ethnicity
Source: US Census Bureau — American Community Survey, 5-year estimates.
Geography
Coordinates & boundaries from the US Census TIGER/Line shapefiles.
Climate
Current forecast
Forecast for Janesville, WI from NOAA NWS API.
Air quality
Industrial & pollution facilities
Natural hazard risk
Health (adults)
Walkability
Amenities nearby
Wildlife & biodiversity
Schools
Earthquake history
Photos
Sights & places nearby
Notable people from here













People born within ~10 km, from Wikidata (CC0). Click any name for their Wikipedia article.
Nearby places in Wisconsin
- Footville10 mi away · pop. 908
- Edgerton11 mi away · pop. 6,014
- Beloit11.1 mi away · pop. 36,534
- Lake Koshkonong12.7 mi away
- Turtle Lake17.4 mi away
- Whitewater17.7 mi away · pop. 15,807
- Fort Atkinson18.6 mi away · pop. 12,463
- Sharon19.3 mi away · pop. 1,592
- Stoughton19.6 mi away
- Albany21.6 mi away · pop. 1,063
- Walworth23.8 mi away
- Williams Bay24.9 mi away
Geography & sun
Elevation, sunrise/sunset and daylight from Open-Meteo. Solar climatology from NASA POWER.
Nearby airports
Public attention
Pageview totals from the Wikimedia Pageviews API.
Books about Janesville

Search results from Open Library.
Recent natural events nearby
Ground air-quality sensors
Recently spotted species
Nearest stream gauge
Live readings from USGS NWIS · measured 2026-10-16 13:00 UTC.
Events
Gallery
Sources
- • Wikipedia
- • US Census Bureau (ACS 5-year estimates)
- • NOAA National Weather Service
- • Wikidata
- • USGS NWIS (water data)
- • Open-Meteo / sunrise-sunset.org
- • Wikipedia Pageviews API
- • Open Library