Hainesville is an unincorporated community in Wood County, Texas, United States. Hainesville is located at the intersection of Farm to Market Road 49 and Farm to Market Road 778 7 miles (11 km) southeast of Quitman. The area around Hainesville was settled in 1845, and Christian H. Haines built a gristmill there in 1870. The Dupree post office moved to the community in 1893; it was renamed Hainesville after Haines.