Williamson   County IL United States

County FIPS 17199
Largest City Marion
State Illinois
Latitude 37.7303
Longitude -88.9299
Population 66,876
Density 159.2 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: $65,604
Median individual: $38,946

Race

Mode: 89.0% White

Gender

 50.2% male 

Rent

  $930 / month  

Median house value: $151,257.0

Age

Median: 41.6 years old

Education

With at least college degree: 26.3%
With STEM degree: 40.9%

Marital Status

 50.8% married 

Never married: 27.4%

Labor Force Participation

 58.8% working 

Unemployed: 5.0%

Average Family Size

 2.76 people 

Commute Time

 23.5 minutes 

Health Care

 4.6% uninsured 

Poverty

 13.8%

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

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