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 66,816. It is also the county seat of Rock County. Janesville is currently growing at a rate of 0.29% annually and its population has increased by 1.77% since the most recent census, which recorded a population of 65,651 in 2020.

The median household income in Janesville is $73,446 with a poverty rate of 9.04%. The median age in Janesville is 40.7 years: 39.2 years for males, and 41.9 years for females. For every 100 females there are 96.6 males.

66.8K
Total Population
1,929
Density (mi²)
194 0.29%
Growth

Janesville Population

Janesville Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202666,8161940.29%
202566,6221940.29%
202466,4282980.45%
202366,1301660.25%
202265,964-49-0.07%
202166,0133620.55%
202065,651180.03%
201964,497190.03%
201864,4781380.21%
201764,3402850.44%
201664,0551280.2%
201563,927290.05%
201463,8981880.3%
201363,7101730.27%
201263,537730.12%
201163,464-168-0.26%
201063,632570.09%
200059,4987,36514.13%
199052,1331,0622.08%
198051,0714,64510.01%
197046,42611,26232.03%
196035,16410,26541.23%
195024,8991,9078.29%
194022,9921,3646.31%
193021,6283,33518.23%
192018,2934,39931.66%
191013,8947095.38%
190013,1852,34921.68%
189010,8361,81820.16%
18809,0182292.61%
18708,7891,08614.1%
18607,70300%

Median Age

Overall: 40.7 years
Female: 41.9 years
Male: 39.2 years

Janesville Adults

There are 52,009 adults, (12,032 of whom are seniors) in Janesville.

Sex Ratio

Female: 33,581 (50.9%)
Male: 32,449 (49.1%)

Demographics

The racial composition of Janesville includes 85.23% White, 3.06% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White56,27685.23%
Two or more races4,7247.15%
Black or African American2,0203.06%
Other race1,7242.61%
Asian1,0381.57%
Native American2390.36%
Native Hawaiian or Pacific Islander90.01%
Race
Population ↓
Percentage (of total)
Two or more races2,4113.65%
Other race1,5202.3%
White9491.44%
Native American1870.28%
Black or African American570.09%
Race
Population ↓
Percentage (of total)
White55,32783.79%
Two or more races2,3133.5%
Black or African American1,9632.97%
Asian1,0381.57%
Other race2040.31%
Native American520.08%
Native Hawaiian or Pacific Islander90.01%

Janesville Marital Status

Economics and Income Statistics

Janesville 's average per capita income is $49,133. Household income levels show a median of $73,446. The poverty rate stands at 9.04%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Married Families$99,932-
Families$88,471$98,869
Households$73,446$85,681
Non Families$45,330$59,155

$49,133

Average Income

$73,446

Median Household Income

9.04%

Poverty Rate

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)