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O'Fallon, IL Demographics & ZIP Codes
O'Fallon, Illinois demographics and median household income by ZIP code (in St. Clair County) — 1 ZIP codes — population 35,536 — median income $100,167 — avg. home value $274,200. Compare income, housing, and population across ZIP codes on US5.
Population
35,536
Median household income (avg.)
$100,167
133% of U.S. median
Average home value
$274,200
79% of U.S. median
Average rent
$1,068
92% of U.S. median
Median age (avg.)
37.2
O'Fallon demographics
O'Fallon, Illinois covers 1 ZIP code primarily in St. Clair County, with a combined ZIP-area population of about 35,536.
Across ZIP codes with age data, the average median age is about 37.2 years.
Median household income in O'Fallon
The average median household income across ZIP codes in O'Fallon, Illinois is about $100,167 — about 28% above the IL ZIP average ($78,143), and about 33% above the U.S. median ($75,149).
The highest median household income among listed ZIPs is about $100,167 in 62269.
Housing in O'Fallon
For housing in O'Fallon, Illinois, the average median home value is about $274,200 and the average median rent is about $1,068.
The most populous ZIP in this set is 62269 (about 35,536 residents). Use the table below to compare population, income, and home values across codes.
ZIP codes in O'Fallon
Sort by population, income, or home value. Click a column header to toggle ascending / descending.
| ZIP | City | County | State | Population ↓ | Income | Home value |
|---|---|---|---|---|---|---|
| 62269 | O'Fallon | St. Clair County | IL | 35,536 | $100,167 | $274,200 |
Frequently asked questions
What are the demographics of O'Fallon?
O'Fallon, Illinois has a combined ZIP-area population of about 35,536 across 1 ZIP codes (primarily St. Clair County). Browse the ZIP table below for population, income, and housing by code.
What is the median household income in O'Fallon?
The average median household income across ZIP codes in O'Fallon, Illinois is about $100,167, about 28% above the state ZIP average ($78,143), and about 33% above the U.S. median ($75,149). Average median home value is about $274,200.
How many ZIP codes are in O'Fallon?
O'Fallon, Illinois includes 1 ZIP codes on US5. Each row links to demographics, median income, and housing for that code.
Where can I find ZIP code demographics for O'Fallon?
This page lists ZIP codes in O'Fallon, Illinois with population, median household income, and home value. Select a ZIP for a full demographics profile.