Warren   County IL United States

County FIPS 17187
Largest City Monmouth
State Illinois
Latitude 40.8488
Longitude -90.6150
Population 16,447
Density 30.34 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: $67,385
Median individual: $35,726

Race

Mode: 82.8% White

Gender

 50.3% male 

Rent

  $788 / month  

Median house value: $105,837.0

Age

Median: 38.5 years old

Education

With at least college degree: 21.9%
With STEM degree: 37.9%

Marital Status

 48.6% married 

Never married: 34.1%

Labor Force Participation

 61.0% working 

Unemployed: 3.6%

Average Family Size

 2.76 people 

Commute Time

 18.8 minutes 

Health Care

 5.0% uninsured 

Poverty

 14.6%

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

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