Janesville Flag

Janesville

County Seat:
No
Area (mi²):
0.061
State:
Illinois

Janesville is a CDP located in Cumberland County, Illinois. Janesville has a 2025 population of 55. Janesville is currently growing at a rate of 7.84% annually and its population has increased by 44.74% since the most recent census, which recorded a population of 38 in 2020.

55
Total Population
896
Density (mi²)
4 7.84%
Growth

Janesville Population

Janesville Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Janesville includes 100% White, and smaller percentages for and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White14100%

Janesville Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

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)