County · Maryland · United States
St. Mary's County ZIP codes
27 ZIP codes · 27 cities · FIPS 24037
Key facts
- State
- Maryland (MD)
- FIPS code
- 24037
- Population
- 114,372
- Median household income
- $114,580
- Median age
- 37
- Land area
- 358.6 sq mi (928.8 km²)
- Population density
- 319 / sq mi
- Area codes
- 227, 240, 301, 410, 443, 667
Cities and ZIP codes in St. Mary's County (27)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.