St. Clair County, IL Demographics & Local Data

Analyze population trends, housing costs, and the local economy by exploring Map AI.

Area Snapshot

Key statistics on population, economy, housing, and commuting compared to state and national averages. Explore interactive maps for deeper analysis.

C
C
C

Population

Metric St. Clair County Illinois Avg U.S. Average
Population 253,307 12,497,595 334,821,731
Population density (per sq mi) 375.6 215.8 85.8
Population growth (%/yr) -0.62% -0.18% 0.57%
Median age 38.1 37.3 37.1
Households 101,271 5,000,691 128,459,983

Population Over Time

Year St. Clair County

Race & Ethnicity

Group Share

Economy

St. Clair County has a the economy index of C, which means it is somewhat prosperous.

Metric St. Clair County Illinois Avg U.S. Average
Median household income $70,146 $82,179 $78,145
Income growth (%/yr) 5.00% 4.78% 5.07%
Unemployment rate 5.5% 5.8% 5.2%

Detailed wealth and income breakdown →

Housing

Metric St. Clair County Illinois Avg U.S. Average
Median home price $100,531 $162,405 $242,182
Median rent $1,032 $1,226 $1,342
Homeownership rate 67.8% 66.8% 65.1%

Full housing market analysis →

Mobility & Commuting

The most common departure window is 07:00 AM – 07:29 AM , followed by 07:30 AM – 07:59 AM .

Metric St. Clair County Illinois Avg U.S. Average
Average commute time (min) 21.8 23.8 22.5
Work from home 10.9% 14.0% 13.4%

Commute and transport details →

Education & Households

St. Clair County has a education index of C, which means it is somewhat educated.

Metric St. Clair County Illinois Avg U.S. Average
Bachelor's degree or higher 28.2% 34.1% 31.6%
Average household size 2.47 2.48 2.54

Health

St. Clair County has a health index of C, which means it is somewhat healthy.

Metric St. Clair County Illinois Avg U.S. Average
Life expectancy (years) 75.9 77.9 78.3
Self-rated poor health 18.2% 15.6% 16.3%
Smokers 19.3% 19.2% 19.0%