Median Age in St. Mary Parish, LA
ACS 2024 5-Year Estimates
39.7 years
Rank #2,201/3,222 · #30 in LA
32th
St. Mary 39.7 years
LA 38.0 years +4.5%
US 38.9 years +2.1%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How St. Mary Parish's median age of 39.7 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 Parish for median age.
Nearby Rankings
Full ranking →| #2,198 | Adair County, KY | 39.7 years |
| #2,199 | Knox County, KY | 39.7 years |
| #2,200 | St. Charles Parish, LA | 39.7 years |
| #2,201 | St. Mary Parish, LA | 39.7 years |
| #2,202 | Baltimore County, MD | 39.7 years |
| #2,203 | Lauderdale County, MS | 39.7 years |
| #2,204 | Tallahatchie County, MS | 39.7 years |
About Median Age
St. Mary Parish, Louisiana has a median age of 39.7 years, ranking #2,201 of 3,222 counties nationwide — 2.1% above the national value of 38.9 years. Within Louisiana, it ranks #30 of 64. This places it in the 32th 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.