Village · Illinois
Flat Rock, Illinois
Flat Rock, village, in Crawford County, Illinois. Flat Rock had 322 residents on July 1, 2025 by the Census Bureau's estimate, down 1.2% since 2020; the 2020 Census counted 323 and the ACS 2020-2024 5-year estimates put it at 337 (±96). GEOID 1726350.
Residents, July 2025 estimate
322
Census Bureau estimate (no margin published)
2020 Census count: 323 · ACS 2020-2024: 337 ±96
Median household income
$51,667
±$24,329 (90% margin)
Illinois: $83,390
Median home value
$66,600
±$9,728 (90% margin)
Illinois: $263,300
Median gross rent
not published
Illinois: $1,274
Where is Flat Rock and what county is it in?
Flat Rock is a village in Crawford County, Illinois. It covers 0.9 square miles of land, 377 residents per square mile in 2020.
Flat Rock lies mostly within Honey Creek Township (Crawford County) and reaches into Montgomery Township (Crawford County), towns or townships with their own local government (2020 census blocks).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Flat Rock, and is it growing?
The Census Bureau estimates that 322 people lived in Flat Rock on July 1, 2025, down 1.2% since 2020, in line with Illinois (−0.8%). The 2020 Census counted 323 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 337 (±96).
| Measure | Flat Rock | Crawford County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 337 ±96 | 18,511 | no clear change |
| Households | 146 ±45 | 7,492 | no clear change |
| Average household size | 2.31 ±0.42 | 2.30 | no clear change |
| Housing units | 171 ±52 | 8,457 | no clear change |
Flat Rock's population since 2000
From 415 in 2000 to 322 in 2025: down 22.4%. The 2000, 2010 and 2020 figures are census counts, each for Flat Rock as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Flat Rock?
The median resident of Flat Rock is 41.5 years old; 17.5% are under 18 and 21.4% are 65 or older. The largest group is non-Hispanic white residents at 95.3%, then non-Hispanic residents of two or more races at 4.7%.
| Measure | Flat Rock | Crawford County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 41.5 ±18.3 | 42.6 | no clear change |
| Under 18 years | 17.5% ±6.8 pts | 20.2% | – |
| 65 years and over | 21.4% ±8.4 pts | 19.8% | – |
| Male | 48.4% ±8.2 pts | 53.1% | – |
| Hispanic or Latino (any race) | 0.0% ±10.5 pts | 2.7% | – |
| White alone, not Hispanic | 95.3% ±4.9 pts | 90.3% | no clear change |
| Black or African American alone, not Hispanic | 0.0% ±10.5 pts | 3.4% | – |
| Asian alone, not Hispanic | 0.0% ±10.5 pts | 0.2% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±10.5 pts | 0.6% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±10.5 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.7% ±4.9 pts | 2.8% | – |
| Some other race alone, not Hispanic | 0.0% ±10.5 pts | 0.1% | – |
| Born outside the United States | 0.0% ±10.5 pts | 1.2% | – |
| Speak a language other than English at home (age 5+) | 0.0% ±11.2 pts | 2.8% | – |
| Civilian veterans (age 18+) | 6.1% ±3.4 pts | 7.9% | – |
| With a disability | 14.8% ±6.5 pts | 14.3% | – |
| No health insurance coverage | 6.5% ±4.7 pts | 5.3% | – |
| High school graduate or higher (age 25+) | 94.0% ±5.8 pts | 90.5% | – |
| Bachelor's degree or higher (age 25+) | 7.2% ±4.3 pts | 20.6% | no clear change |
| Graduate or professional degree (age 25+) | 0.4% ±1.4 pts | 6.5% | – |
| Lived in the same house a year earlier | 93.5% ±5.0 pts | 88.4% | – |
| Moved from another state in the past year | 0.0% ±10.5 pts | 1.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Flat Rock earn?
Half of Flat Rock's 146 households earn less than $51,667 a year (±$24,329), against $71,674 in Crawford County and $83,390 in Illinois. In 2015-2019 it was $43,074 in 2024 dollars; the margins of error cannot tell the two periods apart.
| Measure | Flat Rock | Crawford County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $51,667 ±$24,329 | $71,674 | no clear change |
| Mean household income | $68,847 ±$15,741 | $88,845 | – |
| Per capita income | $32,093 ±$6,559 | $36,486 | no clear change |
| People below the poverty line | 11.9% ±8.9 pts | 12.1% | – |
| Children under 18 below the poverty line | 15.8% ±21.3 pts | 14.0% | – |
| Households receiving SNAP | 12.3% ±7.0 pts | 13.7% | – |
| Households with a computer | 94.5% ±6.0 pts | 93.5% | – |
| Households with a broadband subscription | 88.4% ±7.6 pts | 88.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Flat Rock?
Owners occupy 87.7% of Flat Rock's occupied homes and renters 12.3%. The median owner-occupied home is valued at $66,600 by its owner (±$9,728).
| Measure | Flat Rock | Crawford County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $66,600 ±$9,728 | $121,100 | no clear change |
| Renters paying 35% or more of income on rent | 0.0% ±100.0 pts | 33.4% | – |
| Median monthly owner costs, with a mortgage | $881 ±$123 | $1,264 | – |
| Owner-occupied homes | 87.7% ±8.3 pts | 81.9% | no clear change |
| Renter-occupied homes | 12.3% ±8.3 pts | 18.1% | – |
| Housing units | 171 ±52 | 8,457 | no clear change |
| Homeowner vacancy rate | 2.3% ±4.3 pts | 0.6% | – |
| Rental vacancy rate | 0.0% ±75.1 pts | 11.5% | – |
| Single-family detached homes | 82.5% ±10.5 pts | 84.3% | – |
| Mobile homes | 17.5% ±10.5 pts | 8.5% | – |
| Built 2020 or later | 0.0% ±19.6 pts | 0.6% | – |
| Built 2010 to 2019 | 0.0% ±19.6 pts | 5.0% | – |
| Built 1939 or earlier | 32.2% ±13.9 pts | 22.8% | – |
| Households with no vehicle | 8.9% ±7.6 pts | 6.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Flat Rock work and get to work?
87.9% of Flat Rock's workers drive alone. The average trip to work takes 25.8 minutes.
| Measure | Flat Rock | Crawford County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.7% ±9.4 pts | 55.3% | – |
| Unemployment rate | 1.1% ±2.3 pts | 3.0% | – |
| Drove alone to work | 87.9% ±9.3 pts | 85.0% | – |
| Carpooled | 4.9% ±5.1 pts | 6.6% | – |
| Public transportation | 0.0% ±18.5 pts | 0.2% | – |
| Walked | 0.5% ±1.4 pts | 2.5% | – |
| Worked from home | 5.5% ±5.9 pts | 4.7% | – |
| Mean travel time to work | 25.8 min ±6.0 | 18.1 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Flat Rock?
No census tract lies mostly in Flat Rock; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 8806Crawford County | 2,901 | $60,926 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Flat Rock) · Census block assignment files
How does Flat Rock compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Flat Rock is the 14,896th-most populous of the 19,476 U.S. incorporated places that have one and the 982nd-most populous of 1,294 in Illinois.
Flat Rock is not ranked by income or the other survey measures: those rankings include places of 1,000 or more residents (2020 Census) with a reliable estimate.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 982nd | 1,294 |
Flat Rock's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Flat Rock with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Flat Rock?
26 of the 56 figures for Flat Rock on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Flat Rock are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Flat Rock.