Robertson County is a county in Texas. It covers 866 square miles (554,067 acres), which represents zero percent of the state total. Of Texas's 254 counties, Robertson County ranks 137th in terms of the size of its population (16,659, according to 2015 Census estimates). Mining and mineral extraction-related services are the main economic drivers in this part of Texas. Recent Lands of America data shows that the average price-per-acre value of land for sale in Robertson County is $5,837. The average listing price was $281,185 (the most expensive listing being for $2.3 million) and the median size of land and real estate for sale in Robertson County was seven acres. Land for sale in Robertson County totaled 4,913 acres and $28.7 million in overall land value, with the city of Franklin featuring the most land for sale in the county. Farmland was the most common type of land for sale in Robertson County.