Wapakoneta is a city in Auglaize County, Ohio, United States, and its county seat. Located along the Auglaize River, the city is about 56 miles (90 km) north of Dayton and 83 miles (134 km) south of Toledo. The population was 9,957 at the 2020 census. It is the principal city of the Wapakoneta micropolitan area, which is included in the Lima–Van Wert–Celina combined statistical area.