The overall value of land for sale in Rosebud County recently on Land.com was almost $37 million. This represents approximately 100,000 acres of land and rural real estate for sale in Rosebud County. Rosebud County ranks 40th in the state based on the combined acreage of land for sale of the 56 counties in the Treasure State. Of all farms and ranches for sale in Rosebud County, Forsyth featured the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Montana. Rosebud County is one of the ten biggest counties in Montana (5,025 square miles). It's located in the Southeast Montana region of the state.