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.
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