Jefferson   County MO United States

County FIPS 29099
Largest City Arnold
State Missouri
Latitude 38.2610
Longitude -90.5377
Population 229,458
Density 349.74 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: $82,851
Median individual: $41,832

Race

Mode: 89.3% White

Gender

 50.0% female 

Rent

  $979 / month  

Median house value: $235,669.0

Age

Median: 40.3 years old

Education

With at least college degree: 24.7%
With STEM degree: 40.1%

Marital Status

 54.0% married 

Never married: 27.3%

Labor Force Participation

 66.0% working 

Unemployed: 3.2%

Average Family Size

 3.03 people 

Commute Time

 30.6 minutes 

Health Care

 6.6% uninsured 

Poverty

 9.0%

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

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