The overall value of land for sale in Montgomery County recently on Land.com was around $291 million. This represents almost 8,000 acres of land and rural real estate 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 all counties in the Terrapin State. There were two properties listed as sold in Montgomery County through the Land Network Comparable Sales Program. This represented a total value of $7,445,000. Gaithersburg featured the most land for sale. Government and state-level services are the main economic drivers in Montgomery County. Montgomery County is Maryland's 12th biggest county (506 square miles). It's located in the Capital Maryland region of the state.