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As of 2010, the population was 105,151. Its county seat is Leonardtown. The name is in honor of Mary, the mother of Jesus.
The county has a total area of 764.5 square miles (1,980 km2), of which 361 square miles (930 km2) is land and 403 square miles (1,040 km2) (52.78%) is water. Located on the St. Mary’s Peninsula, St. Mary’s County is largely bordered by water: the Patuxent River (northeast), the Chesapeake Bay (east), the Potomac River (southwest), and the Wicomico River (west). St. Mary’s county lies within the Humid subtropical climate zone, surrounded on three sides by bodies of water, including the Potomac river and Chesapeake Bay. Summers are hot and humid, with frequent afternoon thunderstorms. Winters are mild to cool, with ample rainfall as well.
Saint Mary’s County includes one municipality, classified as a town under Maryland law: Leonardtown, the county seat (incorporated 1858). The county houses the Naval Air Station Patuxent River, which includes Naval Air Systems Command, which plays a significant role in the local economy. The Naval Air Station also has an annex at Webster Field in Saint Inigoes, MD.