The value of all farms, rural land, hunting land and other land for sale in Montgomery County, Maryland, recently was approximately $218 million, representing a total of 12,677 acres of land for sale in Montgomery County. Based on the combined acreage of land and rural property for sale here, Montgomery County has the most land for sale of the 24 counties in the Monumental State. Gaithersburg featured the most land for sale. From an economic perspective, government and state-level services contribute most to Montgomery County's overall GDP. Montgomery County is the 12th biggest county (506 square miles) in Maryland. It's located in the Capital Maryland region of the state.