Of 77 counties in the Sooner State, McClain County ranks 68th in terms of size (580 square miles). McClain County is in Frontier Country Oklahoma. McClain County, Oklahoma, includes approximately 1,000 acres of riverfront homes and property for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was roughly $400,000. Browse all waterfront property for sale in McClain 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 McClain County is house.