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Janesville

Wisconsincity

Photograph of Janesville
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Janesville

Total population

66,434

Median home value

$253,000

26.6%

Bachelor's+

Median income

$66,853

Janesville$67k
National$74k
Weather52°F · Scattered Rain Showers
Coordinates42.68°, -89.01°

Demographic figures from US Census Bureau · ACS 5-year estimates. Overview below cites Wikipedia and may reference a different year.

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Active weather alerts
  • Freeze Warning · Severe
    Freeze 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 Wikipedia

History & 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.

Read full article on Wikipedia

Excerpted from the corresponding Wikipedia article (CC BY-SA).

Demographics & economy

Median age
41.1
Median home value
$253,000
Housing units
30,223
Poverty rate
7.2%
Unemployment
2.5%

Race & ethnicity

White
85.1%
Black
2.1%
Asian
1.3%
Hispanic
10%

Source: US Census Bureau — American Community Survey, 5-year estimates.

Geography

Latitude
42.6847
Longitude
-89.0132
Water area
0.60 mi²
View on OpenStreetMap

Coordinates & boundaries from the US Census TIGER/Line shapefiles.

Climate

Current forecast

This Afternoon
52°F
Scattered Rain Showers
Tonight
29°F
Mostly Clear then Widespread Frost
Saturday
56°F
Widespread Frost then Sunny
Saturday Night
37°F
Clear
Sunday
62°F
Sunny
Sunday Night
39°F
Mostly Clear

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

Browse all places in Wisconsin →

Geography & sun

Avg solar (kWh/m²/day)
3.92
Annual solar (kWh/m²)
1,432

Elevation, sunrise/sunset and daylight from Open-Meteo. Solar climatology from NASA POWER.

Nearby airports

Public attention

Wikipedia views (last 30 days)
3,806
Avg daily Wikipedia views
127
Attention level
Quiet

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

Site
ROCK RIVER AT AFTON, WI
Distance
5.7 mi
Streamflow
2,800 cfs
Gage height
5.55 ft

Live readings from USGS NWIS · measured 2026-10-16 13:00 UTC.

Events

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