Mendon, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Mendon, Illinois had a total population of 1,167, the 660th largest village in Illinois, with a median household income of $65,781, which is 21% lower than the state average. The poverty rate is 15.7%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Housing is very affordable with a home-value-to-income ratio of just 1.7x.
Mendon Quick Facts
How Mendon 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 | 1,131 | 1,167 | +3.2% |
| Median household income | $62,778 | $65,781 | +4.8% |
| Median home value | $108,500 | $111,600 | +2.9% |
How Mendon 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+)
Mendon Rankings in Illinois
Explore Illinois Rankings
Other Cities in Adams County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Quincy | 39,109 | $56,480 | 16.7% | $153,200 |
| Camp Point | 1,230 | $62,188 | 14.9% | $127,800 |
| Payson | 1,100 | $60,478 | 12.4% | $132,000 |
| Ursa | 726 | $64,375 | 10.7% | $161,900 |
| Golden | 693 | $55,000 | 6.4% | $122,800 |
| Clayton | 602 | $66,136 | 12.7% | $91,500 |
| Liberty | 409 | $78,977 | 6.4% | $137,500 |
| Loraine | 341 | $58,750 | 8.8% | $83,600 |
| Lima | 224 | $74,375 | 4.9% | $88,800 |
| Coatsburg | 209 | $63,750 | 6.2% | $81,700 |
Cities Similar to Mendon
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Chatsworth | 1,172 | $69,559 | $103,200 | 10.7% | 16.8% |
| Divernon | 1,164 | $71,750 | $133,700 | 21.0% | 16.1% |
| Atwood | 1,144 | $62,383 | $128,200 | 15.0% | 9.4% |
| Colchester | 1,128 | $63,981 | $91,700 | 14.0% | 7.8% |
| Martinsville | 1,187 | $61,833 | $69,100 | 21.9% | 23.4% |
Population Overview
Mendon is a small community located in Illinois, within Adams County. The total population is 1,167. It ranks as the 660th most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Mendon is 37.6 years. This is 4% lower than the state median of 39.0 years. With 29.4% of the population under 18, Mendon has a notably young demographic profile, suggesting a family-oriented community.
Economy, Income & Housing
The median household income in Mendon is $65,781. This is 21% lower than the state median of $83,390. It is also 19% lower than the national median of $80,734. The poverty rate stands at 15.7%. This is 33% higher than the state poverty rate of 11.8%. The unemployment rate is 4.8%. This is 19% lower than the state rate of 5.8%. The median home value is $111,600. Housing costs are 58% lower than the state median of $263,300. With a home-value-to-income ratio of just 1.7x, Mendon is one of the most affordable housing markets in the area. 78.8% of occupied housing units are owner-occupied. This homeownership rate is 18% higher than the state average of 67.1%.
Race & Ethnicity
Mendon has a predominantly White (non-Hispanic) population, comprising 96.1% of all residents. Hispanic or Latino residents account for 1.0%. The White (non-Hispanic) population is significantly higher than the state average (96.1% vs 58.1%). The Hispanic or Latino population (1.0%) is well below the state average of 18.8%.
Education
12.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 66% lower than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 94.1%.
Data Sources & Methodology
All demographic data for Mendon, 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.
Free data download: Get all Illinois city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of Mendon, Illinois?
Mendon, Illinois has a population of 1,167 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Mendon, IL?
The median household income in Mendon is $65,781, which is 19% lower than the national median of $80,734.
What is the poverty rate in Mendon, IL?
The poverty rate in Mendon is 15.7%. This means approximately 177 residents live below the federal poverty line.
What is the racial makeup of Mendon, Illinois?
Mendon's population is 96.1% White, 0.0% Black, 1.0% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Mendon, IL?
The median home value in Mendon is $111,600. The home-value-to-income ratio is 1.7x.
How educated is Mendon, Illinois?
12.9% of adults (25+) in Mendon hold a bachelor's degree or higher, and 3.0% hold a graduate or professional degree.