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Sidney is a city in Shelby County, Ohio, located approximately 36 mi (58 km) north of Dayton and 100 mi (161 km) south of Toledo. The population was 20,421 at the time of the 2020 census. It is named after English poet Philip Sidney and is the county seat of Shelby County. Many of the city's elementary schools are also named after famous writers, including Ralph Waldo Emerson, Henry Wadsworth Longfellow, and John Greenleaf Whittier. Sidney was the recipient of the 1964 All-America City Award. In 2009, it was the subject of the documentary film 45365.