Sebastian is an unincorporated community in northern Marion Township, Mercer County, Ohio, United States. Its elevation is 932 feet, and it is located at 40°26′39″N 84°31′0″W / 40.44417°N 84.51667°W. Located at the intersection of Sebastian Road and County Road 716-A, the community lies south of the city of Celina, the county seat of Mercer …
Sebastian is an unincorporated community in northern Marion Township, Mercer County, Ohio, United States. Its elevation is 932 feet, and it is located at 40°26′39″N 84°31′0″W / 40.44417°N 84.51667°W. Located at the intersection of Sebastian Road and County Road 716-A, the community lies south of the city of Celina, the county seat of Mercer County, and nearly 2 miles northwest of the village of Chickasaw.