O'Fallon, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of O'Fallon, Missouri is 92,697 as of the 2023 American Community Survey, making it the 7th-largest city in Missouri. The median household income is $107,203, the median home value is $305,100, and the median age is 38.2.
The population has grown 19.2% since 2010 (79,964 → 95,355).
92,697
Population
3034
People / sq mi
$107,203
Median Income
$305,100
Median Home Value
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O'Fallon covers 30.6 sq mi of land at 3034 people per square mile.
About O'Fallon, MO
The poverty rate is what most separates O'Fallon from the typical city: 2.7% of residents live below the federal poverty line, against 12.4% nationally. With 92,697 residents, O'Fallon is a city in Missouri. It is the #7-largest of all cities in Missouri nationally.
Median household income is $107,203, above the US median of $78,538. Poverty is relatively low for US cities at 2.7%, below the national 12.4%. Median home value is $305,100, with typical rent around $1,400.
42.4% of adults 25 and older hold a bachelor’s degree, above the national average of 35.0%. Remote work is above the national 14.0% at 15.7%, and the average commute runs about 26 minutes each way.
O'Fallon city Population History (2010-2024)
The city of O'Fallon city had a population of 79,964 in 2010 and 95,355 in 2024, a 19.2% growth over 14 years. The peak was 95,355 in 2024. Average annual growth rate: 1.27%.
95,355
Population (2024)
79,964
Population (2010)
95,355
Peak (2024)
1.27%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 79,964 |
| 2011 | 81,184 |
| 2012 | 82,136 |
| 2013 | 83,136 |
| 2014 | 84,221 |
| 2015 | 85,061 |
| 2016 | 86,449 |
| 2017 | 87,523 |
| 2018 | 88,364 |
| 2019 | 88,673 |
| 2020 | 91,665 |
| 2021 | 93,747 |
| 2022 | 93,753 |
| 2023 | 94,418 |
| 2024 | 95,355 |
Race & Ethnicity
| White | 82.5% |
| Black or African American | 5.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.0% |
| Two or More Races | 0.0% |
Economy & Income
$107,203
Median Household Income
$47,429
Per Capita Income
2.7%
Poverty Rate
1.9%
Unemployment Rate
Housing
$305,100
Median Home Value
$1,400
Median Rent
80.2%
Owner-Occupied
Education
95.5%
High School+
42.4%
Bachelor's+
Commute
0.1%
Drive Alone
77.7%
Public Transit
15.7%
Work From Home
25.6 min
Avg Commute
Community Profile
25.9%
Foreign Born
93.3%
Non-English at Home
6.2%
Veterans
10.1%
With Disability
96.0%
Health Insurance
97.1%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 21.2% |
| Manufacturing | 11.8% |
| Finance, Insurance & Real Estate | 11.2% |
| Information | 10.9% |
| Education, Health Care & Social Services | 8.0% |
| Construction | 6.8% |
| Arts, Entertainment & Food Services | 5.1% |
| Retail Trade | 4.4% |
| Public Administration | 3.4% |
| Transportation & Warehousing | 1.7% |
| Agriculture & Mining | 0.7% |
Largest cities in Missouri
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Frequently Asked Questions
O'Fallon, Missouri has a population of 92,697 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 7th-largest city in Missouri.
The median household income in O'Fallon, Missouri is $107,203, with 2.7% of residents living below the federal poverty level.
The median home value in O'Fallon, Missouri is $305,100, with median monthly rent at $1,400 and a homeownership rate of 80.2%.
The median age in O'Fallon, Missouri is 38.2 years. The population is 49.2% male and 50.8% female.
The population has grown 19.2% since 2010 (79,964 → 95,355).
O'Fallon city, MO Climate
O'Fallon city, MO has an average annual temperature of 12.8°C (55°F) and receives about 957 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
12.8°C
Avg Temp
957
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -2° / 29° | 45 mm |
| February | 1° / 34° | 51 mm |
| March | 7° / 44° | 85 mm |
| April | 13° / 55° | 94 mm |
| May | 18° / 65° | 107 mm |
| June | 23° / 74° | 89 mm |
| July | 26° / 79° | 100 mm |
| August | 25° / 76° | 80 mm |
| September | 21° / 69° | 82 mm |
| October | 14° / 57° | 75 mm |
| November | 7° / 45° | 81 mm |
| December | 1° / 33° | 68 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit O'Fallon city, MO
The most comfortable months to visit O'Fallon city, MO are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -7°C low). May is usually the wettest month.
Where to stay near O'Fallon
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Population, race, income, age, and trends across Missouri
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.