Celina is a city in Mercer County, Ohio, United States, and its county seat. The population was 10,935 at the 2020 census. Located about 58 miles northwest of Dayton, Celina is situated on the northwe
State Route 703 is a state highway in western Ohio. Its western terminus is in Montezuma at SR 219, its eastern terminus is in St. Marys at an intersection with SR 29, and SR 66, and the southern term