Marshall   County IL United States

County FIPS 17123
Largest City Henry
State Illinois
Latitude 41.0332
Longitude -89.3448
Population 11,647
Density 30.13 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: $71,585
Median individual: $37,351

Race

Mode: 92.8% White

Gender

 50.1% male 

Rent

  $782 / month  

Median house value: $143,333.0

Age

Median: 46.1 years old

Education

With at least college degree: 18.0%
With STEM degree: 51.0%

Marital Status

 53.6% married 

Never married: 26.5%

Labor Force Participation

 56.2% working 

Unemployed: 3.8%

Average Family Size

 2.67 people 

Commute Time

 28.9 minutes 

Health Care

 3.5% uninsured 

Poverty

 11.4%

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

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