NULL Of 254 counties in the Lone Star State, Robertson County ranks 188th in terms of size (865 square miles). Robertson County is in Brazos Texas. The total value of almost 1,000 acres of riverfront land recently listed for sale in Texas's Robertson County was approximately $2 million. Browse all waterfront property for sale in Robertson 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 Robertson County is house.