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Concordia is an unincorporated community and census-designated place (CDP) in Monroe Township, Middlesex County, New Jersey, United States. The CDP is oriented around the age restricted gated community of Concordia. As of the 2020 United States census, the CDP's population was 2,455, down from 3,092 in 2010. Prior to 2020, the corner of Concordia known as The Ponds was split off into its own CDP.