Montgomery   County IL United States

County FIPS 17135
Largest City Litchfield
State Illinois
Latitude 39.2310
Longitude -89.4789
Population 27,942
Density 39.72 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: $63,620
Median individual: $35,546

Race

Mode: 92.7% White

Gender

 53.1% male 

Rent

  $723 / month  

Median house value: $112,250.0

Age

Median: 42.8 years old

Education

With at least college degree: 18.3%
With STEM degree: 43.7%

Marital Status

 49.2% married 

Never married: 28.5%

Labor Force Participation

 52.5% working 

Unemployed: 4.7%

Average Family Size

 2.97 people 

Commute Time

 22.8 minutes 

Health Care

 4.5% uninsured 

Poverty

 12.6%

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

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