Tool
Compare places
Put up to four U.S. cities, towns or census-designated places side by side on 29 figures: 22 measures from the ACS 2020-2024 5-year estimates, each with its margin, and their 2025 population estimate, growth, density, new homes and housing costs against income. A filled square marks a figure that differs from the first place by more than both margins of error allow; without it, the survey cannot tell the two apart.
How do O'Fallon, IL compare?
| Figure | O'Fallon, IL |
|---|---|
| Residents, July 2025 (estimate) | 26,976 |
| Change since April 2020 | +0.1% |
| Residents counted in the 2020 Census | 26,291 |
| Residents per square mile (2020) | 749 |
| Homes permitted in 2025 per 1,000 residents | – |
| Median home value ÷ median household income | 2.8 years of income |
| A year of median rent ÷ median income of all households (renters usually earn less) | 13.8% |
| Measure | O'Fallon, IL |
|---|---|
| Total population | 26,785±42 |
| Median age | 39.1±2.0 |
| Hispanic or Latino (any race) | 6.3%±1.5 pts |
| White alone, not Hispanic | 68.7%±3.1 pts |
| Black or African American alone, not Hispanic | 15.4%±2.6 pts |
| Asian alone, not Hispanic | 2.6%±0.8 pts |
| Born outside the United States | 3.9%±1.5 pts |
| Bachelor's degree or higher (age 25+) | 49.6%±3.1 pts |
| Median household income | $100,136±$11,271 |
| Per capita income | $51,201±$2,909 |
| People below the poverty line | 7.4%±2.7 pts |
| Unemployment rate | 3.5%±1.3 pts |
| Median home value (owner-occupied) | $280,700±$11,937 |
| Median gross rent | $1,153±$103 |
| Renters paying 35% or more of income on rent | 38.0%±9.8 pts |
| Owner-occupied homes | 74.2%±3.3 pts |
| Built 2020 or later | 1.6%±0.8 pts |
| Worked from home | 19.5%±3.3 pts |
| Drove alone to work | 72.4%±3.4 pts |
| Public transportation | 0.5%±0.3 pts |
| Mean travel time to work | 25.6 min±3.0 |
| No health insurance coverage | 4.1%±1.3 pts |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census Bureau population estimates, Vintage 2025; 2020 Census; Building Permits Survey 2025 · Check it at data.census.gov