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is a city in Shelby County, Ohio, United States. The population was 20,211 at the 2000 census. It is named after English poet Sir Phillip Sidney and is the county seat of Shelby County.
As of the census of 2000, there were 20,211 people, 7,981 households, and 5,371 families residing in the city. The population density was 1,938.5 people per square mile (748.2/km²). There were 8,557 housing units at an average density of 820.7/sq mi (316.8/km²). The racial makeup of the city was 92.61% White, 3.06% African American, 0.24% Native American, 1.87% Asian, 0.10% Pacific Islander, 0.40% from other races, and 1.73% from two or more races. Hispanic or Latino of any race were 1.30% of the population.
There were 7,981 households out of which 34.6% had children under the age of 18 living with them, 49.8% were married couples living together, 12.8% had a female householder with no husband present, and 32.7% were non-families. 27.4% of all households were made up of individuals and 10.3% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.03.
In the city the population was spread out with 28.1% under the age of 18, 9.1% from 18 to 24, 29.7% from 25 to 44, 21.3% from 45 to 64, and 11.9% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 95.4 males. For every 100 females age 18 and over, there were 92.8 males.
The median income for a household in the city was $38,663, and the median income for a family was $45,672. Males had a median income of $35,127 versus $22,497 for females. The per capita income for the city was $19,075. About 9.4% of families and 11.5% of the population were below the poverty line, including 15.5% of those under age 18 and 7.9% of those age 65 or over.