City safety & data profile

O'FallonIL

O'Fallon, IL is a 29K-resident city in St. Clair County with a median household income of $105,982.

St. Clair County, Illinois. Federal health, economic, and safety indicators for O'Fallon, drawn from the U.S. Census Bureau American Community Survey, CDC PLACES, and CMS Hospital Compare. O'Fallon has a population larger than 62% of the 4,640 U.S. cities Areazine tracks, and a median home value of $295,700.

Data updated 2026-07-20

29K
Population
Top 38%
By size
$105,982
Median income
$295,700
Median home
6.2%
Poverty rate

The read on O'Fallon

O'Fallon posts a median household income higher than 74% of U.S. cities Areazine tracks.

Top 26%
by median income, US cities

Where O'Fallon income ranks nationally

Median household income vs. every place Areazine profiles (place-level ACS)

$105,982 Top 26% higher than 74% of 3,889 places Areazine profiles

$0–$20,000: 0 places Areazine profiles (0%). Below this entry. $20,000–$40,000: 71 places Areazine profiles (2%). Below this entry. $40,000–$60,000: 788 places Areazine profiles (20%). Below this entry. $60,000–$80,000: 1,055 places Areazine profiles (27%). Below this entry. $80,000–$100,000: 768 places Areazine profiles (20%). Below this entry. $100,000–$120,000: 515 places Areazine profiles (13%). This entry sits in this band. $120,000–$140,000: 308 places Areazine profiles (8%). Above this entry. $140,000–$160,000: 171 places Areazine profiles (4%). Above this entry. $160,000–$180,000: 92 places Areazine profiles (2%). Above this entry. $180,000–$200,000: 47 places Areazine profiles (1%). Above this entry. $200,000–$220,000: 28 places Areazine profiles (1%). Above this entry. $220,000–$240,000: 18 places Areazine profiles (0%). Above this entry. $240,000–$260,000: 28 places Areazine profiles (1%). Above this entry. IL $0 $260,000 every profiled place, bucketed by value

Each bar is a $20K-wide band; taller bars hold more places Areazine profiles. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, American Community Survey (place-level) · 2024 ACS 5-year

The quick read

Reading O'Fallon, IL beyond the headline numbers

O'Fallon sits inside St. Clair County, Illinois, at roughly 38.59°N, -89.91°W. Population 29,002, $105,982 median household income. Median home value $295,700, median rent $1,332. Poverty rate 6.2%, read against that income figure since two cities on the same median can differ underneath it.

CDC PLACES: O'Fallon's highest-prevalence health measure is short sleep duration at 35.1%, then obesity at 34.1%.

Sources: U.S. Census ACS, CDC PLACES, CMS Hospital Compare, plus live alerts for O'Fallon from FEMA, NOAA, FDA, and CPSC. Comparison bars benchmark each metric against the national reference.

Population
29,002
O'Fallon
Median Income
$105,982
+56% vs avg
Median Home Value
$295,700
+30% vs avg
Median Age
37.8
years

10-Year Trends 2013–2024

County-level trend (St. Clair County) - O'Fallon's own historical series isn't separately published by the Census Bureau, so these year-over-year figures track the surrounding county, not the city alone.

20132024
Population
254K-6%
Median Income
$73,854+46%
Median Home Value
$180,300+46%
Poverty Rate
13.6%-23%
Unemployment
5.8%-38%

Economics

Economics indicators for O'Fallon, IL
IndicatorValue
Median Rent
$1,332/mo
Poverty Rate
6.2% -56% vs avg
Unemployment 3.5%
Bachelor's Degree+ 52.4%
Work From Home 20.4%
Public Transit 0.5%

Population

White 70.1%
African American 16.9%
Asian 2.6%
Two or More Ethnicities 5.3%

Health Profile 15 measures

Health Indicators

Short Sleep Duration
35.1%
Obesity
34.1%
High Blood Pressure
32.6%
Binge Drinking
19.6%
Physical Inactivity
18.4%
Frequent Mental Distress
15.2%
Frequent Physical Distress
10.6%
Current Asthma
10.4%
Current Smoking
10.4%
Diabetes
9.7%

Preventive Care

Dental Visit 69.4%
Annual Checkup 79.3%

Other Measures

Lack of Health Insurance
5.4%
Coronary Heart Disease
4.9%
Stroke
2.7%

Frequently Asked Questions 5

What is the population of O'Fallon, IL? ▼
O'Fallon, IL has a population of 29,002 people, located in St. Clair County, Illinois.
What is the median household income in O'Fallon? ▼
The median household income in O'Fallon, IL is $105,982 per year, per the U.S. Census ACS. The poverty rate is 6.2%.
What is the median home value in O'Fallon? ▼
The median home value in O'Fallon, IL is $295,700. Median rent is $1,332/month.
What are the top health concerns in O'Fallon? ▼
The top health indicators in O'Fallon include Short Sleep Duration (35.1%), Obesity (34.1%), High Blood Pressure (32.6%). Data from CDC PLACES.
What is the median age in O'Fallon? ▼
The median age in O'Fallon, IL is 37.8 years. 52.4% of residents have a bachelor's degree or higher.

Safety Context

O'Fallon, IL is located in St. Clair County, Illinois. With a population of 29K and a $105,982 median household income, the community faces health challenges including short sleep duration and obesity. Safety alerts for the O'Fallon area are monitored from federal and state agencies including FEMA, NOAA, FDA, and CPSC.

Safety Guides

How Product Recalls Work

CPSC, FDA & NHTSA recall process explained

Understanding Weather Alerts

Watch vs warning vs advisory explained

Earthquake Magnitude Explained

What the numbers mean & when to act
All safety guides →

Primary source data

EPA Outdoor Air Quality Data

Federal monitoring network, every measurement we report

AirNow - Illinois

Real-time AQI for every monitored Illinois location

National Weather Service

NOAA active watches, warnings, advisories

CDC Air Quality & Health

Health-impact reference for every AQI category

EPA NAAQS standards

National Ambient Air Quality Standards, the regulatory thresholds

Nearby Cities 8

Shiloh, IL 13K Fairview Heights, IL 17K Swansea, IL 14K Belleville, IL 42K Collinsville, IL 25K Troy, IL 10K Glen Carbon, IL 13K Edwardsville, IL 25K
All cities in Illinois → Compare O'Fallon vs Shiloh → All comparisons → Browse all cities

Using O'Fallon's profile

Use this as a starting research checklist, not a verdict on whether to live here.

  • Check live recalls, weather and hazard alerts scoped to the O'Fallon area before relying on national headlines. Check your area
  • Read the poverty rate alongside the income figure, two places with the same median can have very different realities.
  • Compare O'Fallon against Illinois peers on any ranking lens. Explore Illinois

Population and economics (income, home value, poverty, education) are place-level U.S. Census ACS; health is CDC PLACES; hospital counts reflect facilities in and around the city.

Data Sources

All data on this page comes from official U.S. government sources. Population and economic data from the Census Bureau American Community Survey (2024 5-year estimates, place geography). Health data from the CDC PLACES program (2023). Hospital ratings from CMS Hospital Compare (2024). Climate data from NOAA. Education data from NCES. Cost of living from Bureau of Economic Analysis. Crime statistics, where referenced on Areazine, originate from the FBI Crime Data Explorer. Housing market figures referenced on Areazine come from HUD Fair Market Rents. Census economics and population are at place geography; some health and hospital indicators are reported at the county level (St. Clair County) where that is the smallest published unit.

Every figure on Areazine is published directly from official U.S. government sources, no number is typed in by an editor. City demographic and health figures are compiled directly from U.S. Census, CDC, and CMS releases, updated quarterly within 30 days of upstream release. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026.