Median Age in St. Mary's County, MD
ACS 2024 5-Year Estimates
37.2 years
Rank #2,719/3,222 · #22 in MD
16th
St. Mary's 37.2 years
MD 39.4 years -5.6%
US 38.9 years -4.4%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How St. Mary's County's median age of 37.2 years compares to all 3,222 U.S. counties. Values range from 21.4 years to 86.2 years.
Distribution of Median Age Across All Counties
Ranking Context
Counties ranked closest to St. Mary's County for median age.
Nearby Rankings
Full ranking →| #2,716 | Colquitt County, GA | 37.2 years |
| #2,717 | Lincoln County, ID | 37.2 years |
| #2,718 | Beauregard Parish, LA | 37.2 years |
| #2,719 | St. Mary's County, MD | 37.2 years |
| #2,720 | Chaves County, NM | 37.2 years |
| #2,721 | Butler County, OH | 37.2 years |
| #2,722 | Ottawa County, OK | 37.2 years |
About Median Age
St. Mary's County, Maryland has a median age of 37.2 years, ranking #2,719 of 3,222 counties nationwide — 4.4% below the national value of 38.9 years. Within Maryland, it ranks #22 of 24. This places it in the 16th percentile nationally.
The median age of the total population. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.