Of 56 counties in the state, Richland County ranks 32nd by size (2,103 square miles). Richland County is in Missouri River Country Montana. The total value of nearly 1,000 acres of riverfront homes and property recently listed for sale in Montana's Richland County was around $2 million. Browse all waterfront property for sale in Richland County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Richland County is house.