St. Clair County, Illinois

• White (non-Hispanic) 149,879 59.1%
• Hispanic or Latino (any race) 12,858 5.1%
• Black or African American (non-Hispanic) 70,203 27.7%
• Asian (non-Hispanic) 4,098 1.6%
• Two or more races (non-Hispanic) 14,840 5.8%
• American Indian / Alaska Native (non-Hispanic) 382 0.2%
• Native Hawaiian / Pacific Islander (non-Hispanic) 43 0.0%
• Some other race (non-Hispanic) 1,391 0.5%

• Under 18 58,413 23.0%
• 18–24 20,636 8.1%
• 25–44 66,079 26.0%
• 45–64 64,559 25.4%
• 65 and over 44,007 17.3%

Median household income

$78,110

90% interval $74,511–$81,709

−$5,217 vs IL · 27th of 102

Below poverty line

12.7%

90% interval 10.4%–15.0%

+1.2 pp vs IL · 49th of 102

Unemployment (12-mo)

4.7%

−0.17 pp vs. state

County GDP

$16.1B

1.41% of state

Avg. annual pay

$59,034

Establishments

4,802

• Education & health services 23,804 26.7%
• Trade, transportation & utilities 19,980 22.4%
• Leisure & hospitality 11,353 12.7%
• Professional & business services 8,919 10.0%
• Public administration 7,206 8.1%
• Manufacturing 5,216 5.8%
• Other services 3,471 3.9%
• Financial activities 2,824 3.2%
• Information 69 0.1%

The sectors listed cover 92.9% of covered employment; BLS withholds the rest to avoid disclosing individual employers.

Home ownership

68.4%

+1.3 pp vs IL · 92nd of 102

Median gross rent

$1,090

−$184 vs IL · 10th of 102

Owner-occupied

69,023

Renter-occupied

31,823

• Moderately concentrated

  Top three sectors employ 62% of the county workforce. Substantial intra-sector overlap among panelists is likely; confirm employer relationships before sector-specific framing.

• Moderate wage spread

  Highest-paid sector (Professional & business services, $85,447/yr) pays 3.6× the lowest (Information, $23,764/yr). Expect meaningful income variation across the panel.

• Institutional employer scale

  Average establishment employs 19 workers, typical of an institutional-employer economy where large hospitals, plants, schools, and government agencies dominate. Expect many panelists to share an employer rather than work for themselves.

• Democratic 63,433 53.0%
• Republican 54,021 45.1%
• Other / third-party 2,201 1.8%

• Spanish 6,661 2.8%
• Tagalog 732 0.3%
• German or other West Germanic 669 0.3%
• Arabic 593 0.2%
• Chinese 535 0.2%
• Korean 370 0.2%
• French, Haitian, or Cajun 219 0.1%
• Vietnamese 186 0.1%
• Russian, Polish, or other Slavic 131 0.1%

Households

100,846

Family households

63,574

63.0% of households

Married couples w/ children

17,107

26.9% of families

Single-mother families

7,652

12.0% of families

Veterans

21,939

11.5% of civilians 18+

• Evangelical Protestant 47,657 18.5%
• Catholic 34,426 13.4%
• Mainline Protestant 14,324 5.6%
• Black Protestant 13,916 5.4%
• Other (non-Christian + minor traditions) 8,821 3.4%
• Orthodox 330 0.1%

Health insured

94.9%

±0.4 pp

Uninsured

5.1%

±0.4 pp

51st of 102

With a disability

15.2%

±0.7 pp

57th of 102

Bachelor's or higher

31.8%

±1.1 pp

−6.0 pp vs IL · 17th of 102

Uninsured, under 65 (2024)

6.3%

90% interval 5.6%–7.0% · Census SAHIE

The under-65 uninsured rate is not comparable to the ACS insurance figures, which cover all ages.

Trial court

20th Judicial Circuit Court

Judges

17 (Combined Circuit Judge + Associate Judge counts per circuit. Vintage 2024-2025; hand-sourced from per-circuit official court websites and the 2023-2024 Illinois Blue Book (ilsos.gov) judge roster, cross-referenced against the Administrative Office of the Illinois Courts directory. Cook County total of ~400 reflects the Circuit Court of Cook County's combined elected Circuit Judges (~257) plus appointed Associate Judges (~145), the largest unified trial court in the United States. Several smaller downstate circuits carry estimates (see source comments).)

Court seats

Belleville

Traffic fatalities

45

23.04 per 100k adults (18+)

Fatal crashes

40