NULL Of 254 counties in the state, Trinity County ranks 216th by size (713 square miles). Trinity County is in Piney Woods South Texas. Recent Land Network data records roughly 1,000 acres of riverfront land and property for sale in Texas's Trinity County, which is valued at a combined $749,000. 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.