NULL Of 254 counties in the Lone Star State, Washington County ranks 233rd in terms of size (621 square miles). Washington County is in Brazos Texas. Recent Land Network data shows 1,000 acres of riverfront homes and property for sale in Texas's Washington County, which is valued at a combined $5 million. Browse all waterfront property for sale in Washington 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 Washington County is undeveloped land.