All Countries
O'Fallon, IL
Full City Profile · Illinois · St. Clair County County
4.0
/5.0
A
Great
32,139
Population
2,033/sq mi density
$102,793
Median Income
$51,826 per capita
$274,100
Home Value
$306,969 Zillow
$1,312
Median Rent
27.2% income on rent
58°F
Avg Temperature
293 sunny days/yr
179
Violent Crime/100K
1,425 property/100K
A
Overall
4.0 / 5.0
Strong
A+
Economy
5.0 / 5.0
$102,793 median income, 2.1% unemployment
A+
Affordability
5.0 / 5.0
$274,100 home value, $1,312/mo rent
F
Safety
1.0 / 5.0
179 violent crimes/100K
A+
Education
5.0 / 5.0
51.3% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
+10.1%
29,224 → 32,186
over 10 years
Annual Pop. Growth
+0.97%
Compound annual growth rate
Median Income Change
+37%
$75,021 → $102,793
nominal, not inflation-adjusted
Annual Income Growth
+3.2%
Compound annual growth rate
Population Over Time
Total population for O'Fallon across each available Census ACS release.
Median Household Income Over Time
Median household income reported by U.S. Census ACS. Values are nominal (not adjusted for inflation).
Projected 2030
Simple projections extrapolating the 2013–2023 compound annual growth rate forward. These are mathematical extensions of recent trends, not forecasts — real outcomes depend on migration, policy and economic shifts.
Projected Population 2030
34,436
+2,250 from 2023 (32,186)
Projected Median Income 2030
$128,151
+$25,358 from 2023 ($102,793)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 29,224 | — | $75,021 | — |
| 2015 | 29,124 | -0.3% | $76,722 | +2.3% |
| 2017 | 29,364 | +0.8% | $83,043 | +8.2% |
| 2019 | 29,621 | +0.9% | $90,349 | +8.8% |
| 2021 | 32,292 | +9% | $96,698 | +7% |
| 2023 | 32,186 | -0.3% | $102,793 | +6.3% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.