Demographics & People — O'Fallon, Illinois
Population Overview
| Population (Census) | 32,139 |
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| Estimated 2026 | ~32,500 |
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| Median Age | 37.8 |
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| Total Households | 12,461 |
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| Family Households | 9,139 |
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| Average Household Size | 2.58 |
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| Diversity Index | 0.3913 (somewhat diverse) |
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Race & Ethnicity
| White | 23,340 |
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| Black or African American | 4,375 |
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| Asian | 928 |
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| Hispanic or Latino | 1,916 |
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Heritage & Ancestry
| Group | Count |
|---|
| German | 8,341 |
| Other groups | 8,332 |
| Unclassified or not reported | 6,961 |
| English | 4,468 |
| Irish | 3,353 |
| Hispanic: Hispanic or Latino | 1,552 |
| Polish | 1,330 |
| Italian | 1,256 |
| French (except Basque) | 1,241 |
| American | 1,032 |
Language
| English Only | 27,626 |
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| Spanish | 1,002 |
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| Population 5+ | 29,740 |
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Veterans
| Veterans | 4,253 |
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| Population 18+ | 22,342 |
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Commuting
| Mean Commute Time | 25.3 minutes |
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| Work from Home | 20.4% |
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| Commuter Profile | N/A |
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Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for O'Fallon, Illinois.
