NULL Of 254 counties in the state, Marion County is 245th in terms of its size (420 square miles). Marion County is in Northeast Texas. The total value of almost 1,000 acres of riverfront homes and property recently listed for sale in Marion County, Texas, was about $2 million. Browse all waterfront property for sale in Marion 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 Marion County is undeveloped land.