O'Fallon, MO population, income and ZIP codes

O'Fallon city is a small city in Missouri, with 92,697 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #7 of 1,082 ranked by population — larger than 99% of them. The median age here is 38.2 years against 39.1 nationally, a slightly younger profile than the country as a whole. At this size the Census also publishes one-year estimates; the five-year values used here are steadier and let you compare against smaller neighbours on the same basis.

Households in O'Fallon city earn a median of $107,203 a year, 36.5% above the national figure of $78,538 and 93% above the $55,543 median for the 374 Missouri cities we cover. Household income here is measured before tax and pooled across everyone at the address, which is why it reads higher than typical individual earnings in the same area. Poverty reaches 4.7% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in O'Fallon city is valued at $305,100, essentially level with the national figure and 100% above the $152,400 peer median, while median gross rent runs $1,400 a month, essentially level with the national figure, or roughly $16,800 across a full year. A household on the local median income would put about 15.7% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is cheap relative to what people here earn. The home-price-to-income ratio works out to 2.8×, against roughly 3.9× nationally, so buying is easier here than in the average US market. 80.2% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

All values below were released by the Census for this exact geography, with no gap-filling on our side. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.