O'Fallon, Missouri Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
O'Fallon, MO Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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A
Health Above average
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A
Income Above average
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B
Education Around average
Source: Map AI Methodology
Population
| Metric | O'Fallon | Missouri Avg | U.S. Average |
|---|---|---|---|
| Population | 75,454 | 6,186,340 | 337,468,954 |
| Population density (per sq mi) | 2469.4 | 88.8 | 86.4 |
| Population growth (%/yr) | 0.72% | 0.28% | 0.59% |
| Median age | 38.8 | 37.5 | 37.3 |
| Households | 28,614 | 2,507,647 | 130,235,071 |
Population in O'Fallon grew by 30.5% from 2009 to 2024, reaching 75,454 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in O'Fallon is Millennials, aged 29–44, at 22.9% of residents. That is 1.6 points above Missouri as a whole.
- Gen Z 13–28 15,344 20.3% -0.9 pts
- Millennials 29–44 17,244 22.9% +1.6 pts
- Gen X 45–60 17,019 22.6% +2.9 pts
- Boomers 61–79 10,761 14.3% -3.7 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Missouri, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 50.8% of the people living in O'Fallon and men 49.2%.
- Women 50.8% Missouri 50.7%
- Men 49.2% Missouri 49.3%
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Economy
O'Fallon has a the economy index of A, which means it is very prosperous.
| Metric | O'Fallon | Missouri Avg | U.S. Average |
|---|---|---|---|
| Median household income | $112,057 | $70,801 | $80,455 |
| Income growth (%/yr) | 4.43% | 4.56% | 4.80% |
| Unemployment rate | 3.3% | 4.0% | 5.2% |
The median household income in O'Fallon is about 58% higher than in Missouri.
Housing
| Metric | O'Fallon | Missouri Avg | U.S. Average |
|---|---|---|---|
| Median home price | $281,874 | $145,462 | $248,835 |
| Median rent | $1,415 | $1,033 | $1,407 |
| Homeownership rate | 81.6% | 68.1% | 65.2% |
The median home price in O'Fallon is about 16.6 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,415 per month for that long.
Commute Time & Mobility
Commuters in O'Fallon spend about 47 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 196 hours, about 8.2 full days, spent commuting.
| Metric | O'Fallon | Missouri Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 23.5 | 21.0 | 22.4 |
| Round-trip commute (min) | 47.0 | 41.9 | 44.8 |
| Yearly time spent (hours) | 196 | 175 | 187 |
| Estimated yearly cost | $6,075 | $5,415 | $5,790 |
| Work from home | 18.0% | 13.0% | 15.0% |
| Highway traffic (vehicles/day) | 14,759 | 7,545 | 8,813 |
| Local road traffic (vehicles/day) | 3,133 | 923 | 1,355 |
The average commute time in O'Fallon is 24 minutes, longer than the 21 minutes in Missouri.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
O'Fallon has a education index of B, which means it is quite educated.
| Metric | O'Fallon | Missouri Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 37.7% | 28.8% | 31.6% |
| Average household size | 2.63 | 2.40 | 2.53 |
Health
O'Fallon has a health index of A, which means it is very healthy.
| Metric | O'Fallon | Missouri Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 80.2 | 76.9 | 78.3 |
| Self-rated poor health | 11.0% | 19.0% | 16.3% |
| Smokers | 16.4% | 22.8% | 19.0% |
Frequently Asked Questions
Common questions about O'Fallon, Missouri.
What is the population of O'Fallon, Missouri?
About 75,454 people live in O'Fallon, Missouri, in 28,614 households of 2.6 people on average. The median age is 38.8, so residents are older than the U.S. median of 37.3 by about 2 years.
Is O'Fallon, Missouri urban or rural?
Averaged over its land area, O'Fallon, Missouri has 2,469 people per square mile, a density typical of urban and suburban areas. That is about 29 times the U.S. average of 86.
Can a typical household afford a home in O'Fallon, Missouri?
The median home costs 2.5 times the median household income ($281,874 against $112,057), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $1,415 a month takes about 15% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How strong is the job market in O'Fallon, Missouri?
Unemployment in O'Fallon, Missouri is only 3.3%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
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