The value of all land and rural real estate for sale in Calvert County recently was almost $100 million, representing a combined 679 acres of land for sale in Calvert County. Calvert County ranks 10th in the Monumental State for the total number of acres of land currently advertised for sale. Of all farms, rural land, hunting land and other land for sale in Calvert County, Lusby had the most land for sale. Based on its natural assets, tourism and recreation are important contributors to the Calvert County economy. Calvert County is the 21st biggest county (345 square miles) in Maryland. It's located in the Southern Maryland region of the state.