The overall value of land for sale in Richland County, Montana, recently on Land.com was nearly $7 million. This represents almost 1,000 acres of land for sale in Richland County. Richland County ranks 34th out of 56 counties in Montana for the total acreage of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Richland County, Sidney had the most land for sale. Economically speaking, Richland County's is largely dependent on mining and mineral extraction-related businesses and services. Richland County is the 32nd largest county (2,103 square miles) in Montana. It's located in the Missouri River Country Montana region of Montana.