Jefferson   County IL United States

County FIPS 17081
Largest City Mount Vernon
State Illinois
Latitude 38.3005
Longitude -88.9240
Population 36,550
Density 63.99 people per square mile
Time Zone America/Chicago
  • All demographic data comes from the 2024 American Community Survey (5-year study).
  • Learn more about each field.
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Household Income

Median household: $63,118
Median individual: $36,579

Race

Mode: 84.0% White

Gender

 51.6% male 

Rent

  $885 / month  

Median house value: $124,847.0

Age

Median: 41.2 years old

Education

With at least college degree: 18.1%
With STEM degree: 38.8%

Marital Status

 50.3% married 

Never married: 28.5%

Labor Force Participation

 59.0% working 

Unemployed: 5.8%

Average Family Size

 2.95 people 

Commute Time

 19.6 minutes 

Health Care

 7.2% uninsured 

Poverty

 13.5%

All data comes from the SimpleMaps US Counties Database, 2026.

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