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11 hours ago · Website. indy.gov. Indianapolis (/ ˌɪndiəˈnæpəlɪs / IN-dee-ə-NAP-ə-lis), [10][11] colloquially known as Indy, is the capital and most populous city of the U.S. state of Indiana and the seat of Marion County. Indianapolis is situated in the state's central till plain region along the west fork of the White River.