Bluffton is an unincorporated community in Llano County, Texas, United States. According to the Handbook of Texas, the community had an estimated population of 75 in 2000. Bluffton is located along FM 2241 near the western shore of Lake Buchanan, approximately twelve miles northeast of Llano. Although it is unincorporated, Bluffton has a post office, with the ZIP code of 78607. Public education in the community of Bluffton is provided by the Burnet Consolidated Independent School District.