NULL Of 254 counties in the state, Trinity County ranks 216th in terms of size (713 square miles). Trinity County is in Piney Woods South Texas. Recent listings of riverfront land and property for sale in Texas's Trinity County totals roughly 1,000 acres and a combined market value of about $2 million. The most common type of land for sale by combined acreage in Trinity County is undeveloped land. 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 undeveloped land.