St. Charles   County MO United States

County FIPS 29183
Largest City O'Fallon
State Missouri
Latitude 38.7820
Longitude -90.6749
Population 414,535
Density 739.77 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: $104,692
Median individual: $51,269

Race

Mode: 84.0% White

Gender

 50.5% female 

Rent

  $1370 / month  

Median house value: $320,670.0

Age

Median: 39.8 years old

Education

With at least college degree: 42.7%
With STEM degree: 40.7%

Marital Status

 56.0% married 

Never married: 27.9%

Labor Force Participation

 69.4% working 

Unemployed: 2.9%

Average Family Size

 3.04 people 

Commute Time

 24.5 minutes 

Health Care

 4.2% uninsured 

Poverty

 5.2%

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

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