St. Clair County , Illinois
Population: 254,777 residents · 2023 Census ACS
Income $70,178 Home $168,800 Rent $1,032/mo
Page updated: · Data vintage: CDC PLACES 2023 · FEMA NRI v1.20
Across 254,777 residents, St. Clair County tracks on the more affordable end of national norms — useful as a comparison anchor for Illinois and neighboring counties alike. FEMA's National Risk Index ranks St. Clair County in the top 5% nationally for overall natural-hazard exposure, with earthquake risk the dominant local risk.
$70,178
Median Income
household
$168,800
Home Value
median
$1,032/mo
Monthly Rent
median gross
N/A
Unemployment
rate
Income & Housing
| Median Household Income | $70,178 |
| Per Capita Income | $37,824 |
| Poverty Rate | 13.6% |
| Median Home Value | $168,800 |
| Median Gross Rent | $1,032/mo |
| Owner Occupied | 67.8% |
| Renter Occupied | 32.2% |
Demographics & Education
| Total Population | 254,777 |
| Median Age | 39.5 yrs |
| Bachelor's or Higher | 30.7% |
Health Outcomes
CDC PLACES 2023 · % of adults
38.6%
Obesity
11.2%
Diabetes
14.3%
Smoking
39.0%
High Blood Pressure
25.0%
No Physical Activity
21.6%
Depression
38.8%
Insufficient Sleep
80.2%
Annual Checkup
Natural Hazard Risk
FEMA National Risk Index · county-level scores
Overall risk score: 94.9 · 95th national percentile
🌪️ Tornado
95.45
🌀 Hurricane
34.88
🔥 Wildfire
15.08
❄️ Winter Storm
87.24
🌍 Earthquake
98.03
☀️ Drought
61.42
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