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is a city in Miami County, Ohio, United States. The population was 20,738 at the 2000 census. It is part of the Dayton Metropolitan Statistical Area.
Piqua was one of the cities that experienced severe flooding during the Great Dayton Flood of 1913. Piqua is pronounced locally
According to the United States Census Bureau, the city has a total area of 10.9 square miles (28.3 km²), of which, 10.7 square miles (27.7 km²) of it is land and 0.2 square miles (0.6 km²) of it (2.19%) is water.
The Great Miami River runs through Piqua. The area at the south end of town on the east side of the river is known as Shawnee.