Janesville, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Janesville, Illinois had a total population of 39, the 1413th largest community in Illinois. The poverty rate is 0.0%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Only 0.0% of adults have a bachelor's degree, well below the national average of 35.7%.
Janesville Quick Facts
How Janesville Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 14 | 39 | +178.6% |
How Janesville Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Janesville Rankings in Illinois
Explore Illinois Rankings
Other Cities in Coles County
Cities Similar to Janesville
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Literberry | 39 | N/A | N/A | 0.0% | 0.0% |
| Niota | 39 | N/A | N/A | 0.0% | 25.6% |
| Elwin | 40 | N/A | $122,200 | 20.0% | 0.0% |
| Simpson | 40 | $36,250 | $84,000 | 20.0% | 32.5% |
| Kaskaskia | 38 | $150,313 | $145,800 | 22.2% | 0.0% |
A note before these figures: with a population of 39, Janesville's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.
Population Overview
Janesville is a small community located in Illinois, within Coles County. The total population is 39. It ranks as the 1413th most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Janesville is 50.1 years. This is 28% higher than the state median of 39.0 years.
Economy, Income & Housing
The ACS records no residents below the poverty line in Janesville. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. The survey records no unemployed residents in Janesville, which reflects the size of the sample rather than a labor market without joblessness. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 49% higher than the state average of 67.1%.
Race & Ethnicity
Every resident counted in Janesville was recorded as White (non-Hispanic). A figure of exactly 100.0% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.
Education
0.0% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample.
Data Sources & Methodology
All demographic data for Janesville, Illinois is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Illinois state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,445 Census-designated places in Illinois. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Janesville, Illinois?
Janesville, Illinois has a population of 39 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Janesville, IL?
The Census Bureau does not publish a reliable median household income estimate for Janesville — the community is too small for the ACS sample. The national median is $80,734.
What is the poverty rate in Janesville, IL?
The ACS sample for Janesville recorded no residents below the federal poverty line. Because the community is small, this indicates that the survey did not capture poverty here rather than that no poverty exists — the estimate carries a wide margin of error.
What is the racial makeup of Janesville, Illinois?
Janesville's population is 100.0% White, 0.0% Black, 0.0% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Janesville, IL?
The Census Bureau does not publish a reliable median home value estimate for Janesville — there are too few owner-occupied homes in the ACS sample. The national median is $332,700.
How educated is Janesville, Illinois?
0.0% of adults (25+) in Janesville hold a bachelor's degree or higher, and 0.0% hold a graduate or professional degree.