NULL Of 254 counties in the Lone Star State, Trinity County ranks 216th in terms of size (713 square miles). Trinity County is in Piney Woods South Texas. The total value of 1,000 acres of riverfront land recently listed for sale in Texas's Trinity County was around $800,000. Browse all waterfront property for sale in Trinity 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 Trinity County is residential property.