Burr Oak is an unincorporated community in Athens County, Ohio, United States. Burr Oak is located on Ohio State Route 13, north-northeast of Glouster. History A post office called Burr Oak was established in 1887, and remained in operation until 1911. The community was named for burr oak trees near the original town site. References Unincorporated communities in Athens County, Ohio Unincorporated communities in Ohio 1887 establishments in Ohio Populated places established in 1887