Johnson   County IL United States

County FIPS 17087
Largest City Vienna
State Illinois
Latitude 37.4597
Longitude -88.8809
Population 13,376
Density 38.91 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: $62,528
Median individual: $33,231

Race

Mode: 80.5% White

Gender

 57.3% male 

Rent

  $781 / month  

Median house value: $157,850.0

Age

Median: 41.4 years old

Education

With at least college degree: 19.6%
With STEM degree: 32.9%

Marital Status

 40.3% married 

Never married: 36.8%

Labor Force Participation

 42.0% working 

Unemployed: 3.5%

Average Family Size

 3.58 people 

Commute Time

 28.4 minutes 

Health Care

 8.1% uninsured 

Poverty

 17.6%

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

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