Flat Rock, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Flat Rock, Illinois had a total population of 337, the 1049th largest village in Illinois, with a median household income of $51,667, which is 38% lower than the state average. The poverty rate is 11.9%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Household income is 38% below the state average, indicating significant economic challenges.
- Only 7.2% of adults have a bachelor's degree, well below the national average of 35.7%.
- Housing is very affordable with a home-value-to-income ratio of just 1.3x.
- Near full employment with an unemployment rate of just 1.1%.
Flat Rock Quick Facts
How Flat Rock 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 | 362 | 337 | -6.9% |
| Median household income | $49,881 | $51,667 | +3.6% |
| Median home value | $56,700 | $66,600 | +17.5% |
How Flat Rock 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+)
Flat Rock Rankings in Illinois
Explore Illinois Rankings
Other Cities in Crawford County
Cities Similar to Flat Rock
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Herrick | 333 | $53,750 | $73,800 | 7.6% | 9.3% |
| Winslow | 338 | $55,156 | $111,800 | 9.2% | 27.8% |
| London Mills | 328 | $53,125 | $64,400 | 11.8% | 23.5% |
| New Douglas | 346 | $50,000 | $77,500 | 10.6% | 20.0% |
| Chestnut | 347 | $54,091 | $135,600 | 0.0% | 17.3% |
A note before these figures: with a population of 337, Flat Rock'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
Flat Rock is a small community located in Illinois, within Crawford County. The total population is 337. It ranks as the 1049th most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Flat Rock is 41.5 years. This is 6% higher than the state median of 39.0 years. 14.8% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Flat Rock is $51,667. This is 38% lower than the state median of $83,390. It is also 36% lower than the national median of $80,734. The poverty rate stands at 11.9%. This is 1% higher than the state poverty rate of 11.8%. The unemployment rate is 1.1%. This is 81% lower than the state rate of 5.8%. The median home value is $66,600. Housing costs are 75% lower than the state median of $263,300. With a home-value-to-income ratio of just 1.3x, Flat Rock is one of the most affordable housing markets in the area. 87.7% of occupied housing units are owner-occupied. This homeownership rate is 31% higher than the state average of 67.1%.
Race & Ethnicity
Flat Rock has a predominantly White (non-Hispanic) population, comprising 95.3% of all residents. The White (non-Hispanic) population is significantly higher than the state average (95.3% vs 58.1%).
Education
7.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 81% 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 94.0%.
Data Sources & Methodology
All demographic data for Flat Rock, 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 Flat Rock, Illinois?
Flat Rock, Illinois has a population of 337 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Flat Rock, IL?
The median household income in Flat Rock is $51,667, which is 36% lower than the national median of $80,734.
What is the poverty rate in Flat Rock, IL?
The poverty rate in Flat Rock is 11.9%. This means approximately 40 residents live below the federal poverty line.
What is the racial makeup of Flat Rock, Illinois?
Flat Rock's population is 95.3% White, 0.0% Black, 0.0% Hispanic/Latino, and 0.0% Asian.
What is the median home value in Flat Rock, IL?
The median home value in Flat Rock is $66,600. The home-value-to-income ratio is 1.3x.
How educated is Flat Rock, Illinois?
7.2% of adults (25+) in Flat Rock hold a bachelor's degree or higher, and 0.4% hold a graduate or professional degree.