Clark   County IL United States

County FIPS 17023
Largest City Marshall
State Illinois
Latitude 39.3336
Longitude -87.7877
Population 15,266
Density 30.47 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: $72,927
Median individual: $41,081

Race

Mode: 95.2% White

Gender

 50.3% male 

Rent

  $861 / month  

Median house value: $131,613.0

Age

Median: 42.6 years old

Education

With at least college degree: 24.9%
With STEM degree: 41.7%

Marital Status

 55.3% married 

Never married: 24.7%

Labor Force Participation

 61.3% working 

Unemployed: 3.7%

Average Family Size

 2.75 people 

Commute Time

 25.2 minutes 

Health Care

 4.7% uninsured 

Poverty

 9.1%

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

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