St. Mary's   County MD United States

County FIPS 24037
Largest City Lexington Park
State Maryland
Latitude 38.3024
Longitude -76.6058
Population 115,126
Density 321.17 people per square mile
Time Zone America/New York
  • 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: $119,446
Median individual: $59,031

Race

Mode: 71.3% White

Gender

 50.4% male 

Rent

  $1747 / month  

Median house value: $407,593.0

Age

Median: 37.2 years old

Education

With at least college degree: 36.5%
With STEM degree: 50.4%

Marital Status

 52.1% married 

Never married: 32.5%

Labor Force Participation

 68.5% working 

Unemployed: 3.6%

Average Family Size

 3.14 people 

Commute Time

 29.9 minutes 

Health Care

 3.9% uninsured 

Poverty

 8.0%

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

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