O'Fallon, IL
Population 32,139 · Illinois
About O'Fallon, IL
O'Fallon is a mid-sized city in Illinois with a population of 32,139 residents. The median household income is $102,793 per year, which is above the national average. The median age in O'Fallon is 36.9 years.
Housing in O'Fallon has a median home value of $274,100 and median monthly rent of $1,312. Of the 13,152 total housing units, the majority are owner-occupied, with 8,833 owner-occupied and 3,628 renter-occupied units.
The unemployment rate in O'Fallon is 3.3% and the poverty rate is 4.4%. 51.3% of residents hold a bachelor's degree or higher. The average commute time is 26.1 minutes.
Cost of Living in O'Fallon, IL
Compared to national averages, O'Fallon has a median household income of $102,793 (37% above the national median of $75,149). Home values average $274,100, which is 12% above the national median. Monthly rent at $1,312 is 13% above the US average of $1,163. Within Illinois, O'Fallon's income is 37% above the state average of $75,072, and home values are 65% above the state median of $165,779.
Why Live in O'Fallon, IL?
O'Fallon offers a strong local economy with a median household income of $102,793, well above the national average, and a strong job market with an unemployment rate of just 3.3%, and a well-educated community where 51.3% of residents hold a bachelor’s degree or higher. Additionally, the city features a low poverty rate of 4.4%, better than the national average.
O'Fallon has a population of 32,139 with a median age of 36.9 years. Compare O'Fallon with other cities to see how it stacks up, or explore all cities in Illinois.
Similar Cities Near O'Fallon
Cities in Illinois with a similar population size.
| City | Population | Median Income | Home Value | |
|---|---|---|---|---|
| Elk Grove Village | 32,132 | $95,216 | $334,400 | Compare |
| Pekin | 31,812 | $58,355 | $118,200 | Compare |
| Mundelein | 31,632 | $107,608 | $285,600 | Compare |
| St. Charles | 32,733 | $115,350 | $369,700 | Compare |
| Glendale Heights | 32,864 | $82,232 | $249,000 | Compare |
| North Chicago | 30,772 | $56,815 | $147,800 | Compare |
| Gurnee | 30,486 | $121,410 | $331,100 | Compare |
| Woodridge | 33,889 | $97,263 | $345,200 | Compare |
Demographics
Racial & Ethnic Composition
Economy & Education
Housing
Other Cities in Illinois
Data source: US Census Bureau ACS 5-Year Estimates. Last updated: 2026-04-05.
Compare O'Fallon With Other Cities
Frequently Asked Questions about O'Fallon
What is the population of O'Fallon, IL?
The population of O'Fallon, IL is 32,139 according to the latest Census data.
What is the median household income in O'Fallon?
The median household income in O'Fallon, IL is $102,793 per year.
What is the median home value in O'Fallon?
The median home value in O'Fallon, IL is $274,100.
What is the average rent in O'Fallon?
The median monthly rent in O'Fallon, IL is $1,312.
What is the unemployment rate in O'Fallon?
The unemployment rate in O'Fallon, IL is 3.3%.