St. Mary's County, MD — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
114,372
Male
57,683
50.4%
Female
56,689
49.6%
Median Age
37.0 yrs
Avg Household Size
2.7
Foreign Born
4.5%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher23.6%
High School or Higher42.8%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
10.4%
Disability
0.0%
Non-English Home
5.1%
Married
42.7%
St. Mary's County, MD has a population of 114,372 according to 2023 Census Bureau estimates. The median age is 37.0 years. The largest racial or ethnic group is White at 72.3% of the population. 23.6% of residents hold a bachelor's degree or higher. 4.5% of residents are foreign-born.