O'Fallon, IL
Population 32,139 · Illinois
About O'Fallon, IL
O'Fallon is a mid-sized city located in Illinois with a population of 32,139 residents according to the latest US Census Bureau American Community Survey data. The median household income is $102,793 per year, which is 37% above the national median of $75,149. The median age of 36.9 years is close to the US median age of 38.9 years.
Housing Market Overview
The housing market in O'Fallon features a median home value of $274,100, which is 12% above the national median of $244,900. This positions O'Fallon in a moderately priced market relative to the rest of the country. Median monthly rent is $1,312, 13% above the national average of $1,163/month. Of the 13,152 total housing units, 71% are owner-occupied (8,833 units) and 29% are renter-occupied (3,628 units). The high homeownership rate suggests a stable, established residential community.
Economy & Employment
The local economy in O'Fallon shows an unemployment rate of 3.3%, which is lower than the national rate of 3.7%, indicating a relatively strong job market. The poverty rate stands at 4.4%, below the national average of 12.4%, reflecting generally favorable economic conditions. Workers in O'Fallon have an average one-way commute time of 26.1 minutes.
Education & Demographics
51.3% of O'Fallon residents aged 25 and older hold a bachelor's degree or higher, compared to the national average of 33.7%. This significantly higher educational attainment rate often correlates with access to knowledge-economy jobs and higher household incomes. The community's demographic composition includes 3.7% White, 2.5% Hispanic or Latino, 0.6% Black or African American, and 1.6% Asian residents, with 4.2% of the population being foreign-born.
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 US Census Bureau American Community Survey estimates. This makes it a mid-sized city in Illinois.
What is the median household income in O'Fallon?
The median household income in O'Fallon, IL is $102,793 per year, which is 37% above the national median of $75,149.
What is the median home value in O'Fallon?
The median home value in O'Fallon, IL is $274,100, which is 12% above the national median of $244,900. The majority of housing units are owner-occupied.
What is the average rent in O'Fallon?
The median monthly rent in O'Fallon, IL is $1,312, which is 13% above the national average of $1,163/month.
What is the unemployment rate in O'Fallon?
The unemployment rate in O'Fallon, IL is 3.3%, compared to the national average of 3.7%. This lower-than-average rate suggests a relatively healthy local job market.
Is O'Fallon, IL a good place to live?
O'Fallon offers above-average incomes, a competitive housing market, and a strong job market. With a population of 32,139 and a median age of 36.9, the city appeals to a broad range of residents.
How educated is O'Fallon, IL?
51.3% of residents in O'Fallon aged 25 and older hold a bachelor's degree or higher, compared to the national average of 33.7%. This above-average educational attainment often reflects a knowledge-based local economy.
What is the cost of living in O'Fallon?
Key cost-of-living indicators for O'Fallon, IL: median home value is $274,100 (12% above national), median rent is $1,312/month, and median household income is $102,793. The home-value-to-income ratio is 2.7x, indicating relatively affordable housing relative to local incomes.
What is the poverty rate in O'Fallon?
The poverty rate in O'Fallon, IL is 4.4%, compared to the national average of 12.4%. This below-average poverty rate reflects generally favorable economic conditions in the community.
How diverse is O'Fallon, IL?
O'Fallon's population is 3.7% White, 2.5% Hispanic or Latino, 0.6% Black or African American, 1.6% Asian, and 13.5% two or more races. 4.2% of residents are foreign-born.