Of 56 counties in the state, Roosevelt County ranks 29th in terms of size (2,369 square miles). Roosevelt County is in Missouri River Country Montana. There is about 1,000 acres of riverfront land for sale in Roosevelt County, Montana, based on recent Land Network data. The combined market value of farms, ranches, hunting land and other land for sale here is $100,000. Browse all waterfront property for sale in Roosevelt 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 Roosevelt County is undeveloped land.