Clayton, NC
Population, housing, work, and travel data for this Census place.
- Population
- 32,633
- Median home
- $329,600
Census place 1755249
O'Fallon
A Census profile of the people, homes, and daily patterns that shape this place.
Official Census name: O'Fallon cityRelocation snapshot
What stands out in O'Fallon.
According to the 2025 estimate, O'Fallon has a population of 32,656 and 2,066 residents per square mile. Of the six relocation measures evaluated, the three largest relative differences from the median among 225 covered Illinois places are: population density is 2,066/sq mi, below the comparison median of 2,707/sq mi; median household income is $105,982, above the comparison median of $90,282; and average annual high is 68.9°F, above the comparison median of 59.7°F. These unweighted medians compare covered Census places and are not statewide estimates.
- population density
- 2,066/sq mi Below the comparison median of 2,707/sq mi
- median household income
- $105,982 Above the comparison median of $90,282
- average annual high
- 68.9°F Above the comparison median of 59.7°F
National context
Follow the metrics.
Compare O'Fallon's values with other covered Census places. Rankings are descriptive, not recommendations.
At a glance
A city in numbers.
- Population
- 32,656 2025 estimate
- Annual change
- +1.5% Population estimate
- Density
- 2,066/sq mi 15.8 sq mi land area
- Median age
- 37.8 years ACS 5-year estimate
Living here
The everyday equation.
Households, homes, education, and the time it takes to get around.
- Median household income
- $105,982
- Median home value
- $295,700
- Median gross rent
- $1,332
- Bachelor’s degree or higher
- 52.4%
- Typical commute
- 25.3 min
- Drive-alone commute
- 70.5%
- Public transit commute
- 0.5%
- Walked to work
- 2.2%
Housing
Who rents, and what it takes.
Renter share and rent burden help describe the housing choices visible in this place.
- Renter-occupied homes
- 29.8%
- Renters paying 30%+ of income
- 47%
Work
How the workday lands.
Employment status and working-from-home share add context to income and commuting patterns.
- Employed residents 16+
- 60.6%
- Unemployed residents 16+
- 2.3%
- Working from home
- 20.4%
Community
The everyday infrastructure.
Access, mobility, housing growth, and household composition add another layer to a place's day-to-day picture.
- Households with broadband
- 94.5%
- Homes built 2020+
- 2.5%
- Households without a vehicle
- 5.9%
- Households with children
- 36%
- Residents with a disability
- 10.8%
- Residents without insurance
- 4%
Environmental context
A record of declared events.
FEMA declarations for St. Clair County provide historical context, not a forecast or a property-level risk assessment.
- Environmental declarations since 2000
- 7
- Flood declarations
- 3
- Hurricane declarations
- 1
- Severe Ice Storm declarations
- 1
Climate normals
The long view of weather.
Thirty-year averages, not a forecast. Temperature and precipitation describe the typical conditions recorded from 1991 through 2020.
Representative station: BELLEVILLE SIU RSCH (6 mi from place center)- Average high
- 68.9°F
- Average low
- 46.4°F
- Annual rainfall
- 43.4"
- Annual snowfall
- 11.2"
Month by month
A year in O'Fallon.
JFMAMJJASOND
JFMAMJJASOND
Data vintage
Population is from the 2025 Population Estimates Program. Household, housing, education, and commute data are from the 2020-2024 American Community Survey 5-year release. Disaster declarations are from FEMA's OpenFEMA dataset and are refreshed with this edition.
Population estimatesACS profileTIGERweb boundaryNOAA climate normalsFEMA declarations
Similar places
More places to consider.
Selected by the closest mix of population, density, median home value, and average annual high.
Maryville, TN
Population, housing, work, and travel data for this Census place.
- Population
- 32,442
- Median home
- $358,100
Brownsburg, IN
Population, housing, work, and travel data for this Census place.
- Population
- 34,089
- Median home
- $309,400
Keep exploring
Compare O'Fallon with Clayton →