O'Fallon city, Missouri Demographics & Population 2026

Population Overview

O'Fallon city is a mid-sized community located in Missouri. The total population is 92,697. It ranks as the 7th most populous out of 1,062 cities and towns in Missouri.

Age Demographics

The median age in O'Fallon city is 38.2 years. This is 2% lower than the state median of 38.9 years.

Economy, Income & Housing

The median household income in O'Fallon city is $107,203. This is 56% higher than the state median of $68,920. Compared to the national median of $78,538, household income here is 36% higher. The poverty rate stands at 4.7%. This is 63% lower than the state poverty rate of 12.6%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 2.6%. This is 36% lower than the state rate of 4.1%. The median home value is $305,100. Housing costs are 42% higher than the state median of $215,600. With a home-value-to-income ratio of just 2.8x, O'Fallon city is one of the most affordable housing markets in the area. 80.2% of occupied housing units are owner-occupied. This homeownership rate is 18% higher than the state average of 67.9%.

Race & Ethnicity

The largest racial or ethnic group in O'Fallon city is White (non-Hispanic), making up 81.4% of the population. Hispanic or Latino residents account for 5.1%. The Black or African American population (5.0%) is well below the state average of 11.0%. The Asian population is significantly higher than the state average (4.1% vs 2.1%).

Education

42.4% of residents aged 25 and older hold a bachelor's degree or higher. This places O'Fallon city in the top 10% of all cities in the state for educational attainment. This is 33% higher than the state rate of 31.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.5%.

Data Sources & Methodology

All demographic data for O'Fallon city, Missouri is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Missouri state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,062 Census-designated places in Missouri. For official data, visit data.census.gov.