Duval County is in Rio Grande Plains Texas. Of the 254 counties in the Lone Star State, Duval County is 14th in terms of its size (1,795 square miles). Texas's Duval County includes roughly 2,000 acres of farms for sale based on recent Land Network data. The combined market value of land for sale here was about $10 million. The average price of farmland for sale in Duval County was $543,735. Farms for sale in Duval County feature livestock including cattle, horses, goats, sheep and pig. Browse all Texas farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or lifestyle needs.