Jutting into the Chesapeake Bay on Maryland's Western Shore, Saint Mary's County offers a mix of residential, recreational and agricultural land. There was a combined approximately $104 million of farms, hunting land and other rural land and acreage for sale in Saint Mary's County recently on Land.com. The total acreage of all Saint Mary's County land for sale was approximately 2,000 acres. Saint Mary's County ranks seventh in Maryland for the total number of acres of land currently advertised for sale. Leonardtown had the most land for sale. Saint Mary's County is one of the ten biggest counties in Maryland (764 square miles). It's located in the Southern Maryland region of the state.