St. Mary’s County Historical Society


The people of St. Mary's County have been making history since the Ark and Dove arrived from England in 1634. Known as Maryland's Mother County, St Mary's County's rich history connects the present with the past.
Its people, beautiful landscapes, and stunning waterways make St. Mary's County truly a special place to visit and to live. Whether you are a long-time resident, a new member to our community, or a visitor eager to explore the past, the St Mary's County Historical Society, opens the door to those who have gone before -- to their idealism, their courage, their struggles, and their successes. Doors to the people and events that shaped the County, Maryland, and  America.
History matters because of the people who made it. 
Learn more about St Mary's County. Join us to explore its people and history! 
Business Office, Bookstore, and Tours
Wednesday through Friday 9:00 am to 4:00 pm
Research Center
Thursday and Friday 11:00 am to 4:00 pm 
 2nd and 4th Saturdays 10:00 am to 4:00 pm

The Historical Society is Headquartered in historic Tudor Hall 

41680 Tudor Place
Leonardtown, MD 20650
Tudor Hall. Home of the SMCHS
Tudor Hall
 Home of the St. Mary's County Historical Society
A fine example of Georgian architecture,Tudor Hall is an 18th century manor house and the oldest building in Leonardtown. Built by the Barnes family, Abraham and his son, Richard, were both active in the American Revolution. The name Tudor Hall was given by its 19th century owner, Henry G.S. Key, a cousin of Francis Scott Key the composer of the US National Anthem.

41625 Court House Drive 
Leonardtown, MD 20650
The Old Jail Museum
Built in 1876 and in continual use until 1945, the granite block and brick structure retains its original upstairs cells where prisoners were once segregated by gender and race. The jail keeper's quarters downstairs house artifacts that relate to the history of Saint Mary's County. A cannon from the Ark, one of two ships that brought the first colonists to Maryland, and later used to defend St. Mary's City, is displayed on the grounds.
Thursday and Friday 10:00 am to 2:00 pm
Subject to availability. Call 301-475-2467 for further information