[County Seal, St. Mary's County, Maryland] Origin: What would become St. Mary's County was land where the Conoy Indians lived. Here, the settlement of Lord Baltimore's Maryland began with the arrival of the passengers who had set sail on the Ark and the Dove from Cowes, England, on November 22, 1633. They landed at St. Clement's Island in the Potomac River on the southwestern side of present-day St. Mary's County on March 25, 1634. The date of their landing is commemorated annually as Maryland Day.

Established in 1637 (probably by an order of the Governor), St. Mary's, the first Maryland county, was named in honor of Mary, the mother of Jesus.

[photo, Courthouse, 41605 Court House Drive, Leonardtown, Maryland] Boundaries: Bounded north & west by Charles County & Wicomico River; northeast by Chesapeake Bay & Patuxent River; south & southwest by Potomac River.
County Code
County Seat: Leonardtown, MD 20650
Form of Government: County Commissioners
Population: 1990 census: 75,974; 2000 census: 86,211; 2010 census: 105,151

Courthouse, 41605 Court House Drive, Leonardtown, Maryland, November 2017. Photo by Diane F. Evartt.


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[photo, Breton Bay in distance, Society Hill Road, Leonardtown, Maryland]
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  • Breton Bay in distance, Society Hill Road, Leonardtown, Maryland, April 2018. Photo by Diane F. Evartt.

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    St. Mary's County Library System, 23250 Hollywood Road, Leonardtown, Maryland, November 2017. Photo by Diane F. Evartt.

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