Jutting into the Chesapeake Bay on Maryland's Western Shore, Saint Mary's County offers a mix of residential, recreational and agricultural land. A total of almost 2,000 acres were listed for sale in Saint Mary's County recently, representing a total value of approximately $87 million in Saint Mary's County land and rural real estate for sale. Saint Mary's County ranks ninth out of 24 counties in the Terrapin State for the total number of acres of land currently advertised for sale. Among cities in Saint Mary's County with land and rural real estate for sale, Lexington Park 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 Maryland.