Janesville Flag

Janesville

County:
Bremer County
County Seat:
No
Area (mi²):
1.39
State:
Iowa

Janesville is a city located in Bremer County, Iowa. Janesville has a 2026 population of 1,059. Janesville is currently growing at a rate of 0.38% annually and its population has increased by 2.12% since the most recent census, which recorded a population of 1,037 in 2020.

The median household income in Janesville is $103,542 with a poverty rate of 5.45%. The median age in Janesville is 47 years: 44.8 years for males, and 50 years for females. For every 100 females there are 105.6 males.

1.1K
Total Population
762
Density (mi²)
4 0.38%
Growth

Janesville Population

Janesville Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
20261,05940.38%
20251,05530.29%
20241,05250.48%
20231,04710.1%
20221,04640.38%
20211,04250.48%
20201,03710.1%
201998850.51%
201898360.61%
201797730.31%
201697440.41%
201597070.73%
2014963181.9%
201394550.53%
201294090.97%
201193110.11%
201093220.22%

Median Age

Overall: 47 years
Female: 50 years
Male: 44.8 years

Janesville Adults

There are 723 adults, (142 of whom are seniors) in Janesville.

Sex Ratio

Female: 446 (48.6%)
Male: 471 (51.4%)

Demographics

The racial composition of Janesville includes 97.38% White, and smaller percentages for Asian, other race, Two or more races and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White89397.38%
Asian101.09%
Other race90.98%
Two or more races50.55%
Race
Population ↓
Percentage (of total)
Other race20.22%
Two or more races20.22%
Race
Population ↓
Percentage (of total)
White89397.38%
Asian101.09%
Other race70.76%
Two or more races30.33%

Janesville Marital Status

Economics and Income Statistics

Janesville 's average per capita income is $58,690. Household income levels show a median of $103,542. The poverty rate stands at 5.45%.

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
Families$118,000$119,383
Married Families$114,417-
Households$103,542$103,900
Non Families$42,708$50,379

$58,690

Average Income

$103,542

Median Household Income

5.45%

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)