Cost of Living in O'Fallon, MO

With a cost of living index of 101, O'Fallon, MO is right around the national average in cost. Living here is 1% more expensive than the national average and 26% above the Missouri state average of 75. With a population of 92,697, O'Fallon is a mid-sized community that balances access to services with a more manageable cost of living compared to larger metros.

Housing costs are the biggest factor in O'Fallon's cost of living. The median monthly rent is $1,400 (6% above the US median of $1,319), and the median home value sits at $305,100 (0% below the national median of $304,900). At current prices, the median home costs roughly 2.8x the median household income — well within traditional affordability guidelines.

The median household income in O'Fallon is $107,203, which is 43% higher than the national median of $75,149. Residents spend roughly 16% of household income on rent. This is a comfortable ratio, well below the 30% threshold that financial experts recommend as a maximum.

Everyday prices in the St. Louis, MO-IL (Metropolitan Statistical Area) metro area are generally below the national average. Out of 6 common items tracked by the Bureau of Labor Statistics, 6 are priced lower than the US average. These real-world prices — from groceries to electricity — add up and should be factored into any cost of living comparison.

Data sources: US Census Bureau (ACS 2023), Zillow Home Values, HUD Fair Market Rents, BEA Regional Price Parities, BLS Average Prices, and NOAA Climate Normals. Updated monthly.