Jury Pool Profile
Jefferson County, Illinois
- County seat
- Mount Vernon
- Judicial district
- 2nd Judicial Circuit Court
- Population (July 2025 estimate)
- 36,147
- Census PEP. The five-year ACS survey average is 36,550.
At a glance
Jefferson County is a 36,147-person venue. The county population is 84% White and 6% Black (Census race-alone categories). Median household income is $61,746, $21,581 below the IL state median of $83,327; 18.2% of residents 25 and over hold a bachelor's degree or higher. 3.6% of residents 5 and older speak a language other than English at home, most commonly German or other West Germanic and Spanish. The largest published sector is Education & health services, at 27.6% of covered employment, average pay $60,936/year. Trailing-12-month unemployment is 5.34%, above the 4.85% state average. The county carried the Republican presidential candidate in 2016, 2020, and 2024, taking 70% to 73% of the vote across the three.
- Population
- 36,550
- Median household income
- $63,118
- Unemployment
- 5.3%
Who sits on a jury?
≥70% White (race-alone) and <20% Black. This county: 84% / 6%.
Jefferson County has a population of 36,550, with a median age of 41.2. By Census race-alone categories, White residents make up 84.0%; Black residents 6.2%. Independently, 2.8% of residents identify as Hispanic or Latino of any race.
The median household earns $61,746; 18.2% of residents 25 and over hold a bachelor's degree or higher; 12.9% live below the federal poverty line.
Economic context
Counting the cells BLS withholds (private jobs estimated from Census County Business Patterns, government jobs from the statewide mix), the two largest sectors are within 20% of each other: Education & health services about 5,370, Trade, transportation & utilities about 4,540.
Education & health services is the largest published sector at 27.6% of covered employment, followed by Trade, transportation & utilities at 22.9%. Trailing-12-month unemployment is 5.34%, above the Illinois state average.
Political composition
Republican candidate carried this county in 2016, 2020, and 2024 (avg winning share: 71%). 'Strongly' threshold: ≥60% avg.
Jefferson County was carried by the Republican candidate in the 2016, 2020, and 2024 cycles, with 73.3% in 2024, 71.6% in 2020, 69.5% in 2016.
Languages, households, faith & health
Family households are 64% of all households (thresholds: ≥70% = 'family-dominant'; 50–70% = 'family-majority'; <50% = 'singles/nonfamily-majority'). 3.6% of residents 5 and older speak a language other than English at home (threshold for 'linguistically diverse' is ≥10%).
3.6% of residents 5 years and older speak a language other than English at home. The most common are German or other West Germanic, Spanish, Tagalog. Veterans account for 7.7% of the adult civilian population (2,196 individuals).