The combined value of farms and ranches for sale in Musselshell County, Montana, recently on Land.com was $33 million. This represents around 9,000 acres of farms, ranches, hunting land and other land for sale in Musselshell County. Musselshell County ranks 23rd in Big Sky Country for the total acreage of land currently advertised for sale. Roundup featured the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Montana. Musselshell County is Montana's 35th largest county (1,871 square miles). It's located in the Southeast Montana region of the state.