Piqua 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 settled as two separate communities in 1780, known as Upper Piqua and Lower Piqua. The two villages united by 1800. Officially incorporated in 1807, Piqua developed along with construction of the Miami and Erie Canal.
According to the United States Census Bureau, the city has a total area of 11.89 square miles (30.79 km²), of which 11.62 square miles (30.10 km²) is land and 0.27 square miles (0.70 km²) 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.
As of the census of 2010, there were 20,522 people, 8,318 households, and 5,425 families residing in the city. The population density was 1,766.1 inhabitants per square mile (681.9/km²). There were 9,311 housing units at an average density of 801.3 per square mile (309.4/km²). The racial makeup of the city was 92.4% White, 3.3% African American, 0.2% Native American, 0.7% Asian, 0.4% from other races, and 2.9% from two or more races. Hispanic or Latino of any race were 1.4% of the population.
There were 8,318 households of which 32.6% had children under the age of 18 living with them, 44.9% were married couples living together, 14.2% had a female householder with no husband present, 6.1% had a male householder with no wife present, and 34.8% were non-families. 28.7% of all households were made up of individuals and 12.2% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.96.
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