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St. Mary’s County Map, Maryland

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St. Mary’s County, Maryland

Saint Marys Location Map Maryland

At the southern tip of Maryland, St. Mary’s County is where the Potomac River meets the Chesapeake Bay. It’s the birthplace of Maryland, with St. Mary’s City standing as the state’s first colonial settlement.

Come here to explore the past at the Historic St. Mary’s City living museum. The county is also home to the Patuxent River Naval Air Station.

Fishing, boating, and crabbing are everyday activities here, thanks to miles of shoreline. You’ll find a slower pace of life, with farms, vineyards, and local markets across the landscape.

CategoryDetails
County NameSt. Mary’s County
County SeatLeonardtown
Population115,000
Cities, Towns, and CommunitiesLeonardtown, California, Lexington Park, Great Mills, St. Inigoes, and others
Interstates and HighwaysU.S. Route 235, Maryland Route 4, Maryland Route 5, Maryland Route 235
FIPS Code24-037
Total Area (Land and Water)370.0 square miles (land: 357.1 sq mi, water: 12.9 sq mi)
Adjacent Counties (and Direction)Calvert County (Northeast), Charles County (Northwest), Somerset County (Southeast), Northumberland County, Virginia (South), Westmoreland County, Virginia (Southwest), Dorchester County (East)
Time ZoneEastern Time Zone (EST)
StateMaryland
Coordinates38.22°N, 76.77°W
EtymologyNamed in honor of St. Mary and the religious significance of its name.
Major LandmarksHistoric St. Mary’s City, Point Lookout State Park, Piney Point Lighthouse, Patuxent River Naval Air Station
WebsiteSt. Mary’s County Website

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