what county is piqua
Piqua, Ohio. Piqua /ËpÉªkwÉ/ PIK-wÉ is a city in Miami County, Ohio, United States. The population was 20,522 at the 2010 census. It is part of the Dayton Metropolitan Statistical Area. Piqua was one of the cities that suffered severe flooding during the Great Dayton Flood of 1913.