Beacon is a city located on the Hudson River in Dutchess County, New York, United States. As of the 2020 census, the city's population wa…Beacon is a city located on the Hudson River in Dutchess County, New York, United States. As of the 2020 census, the city's population was 13,769. Beacon is part of the Kiryas Joel–Poughkeepsie–Newburgh Metropolitan Statistical Area as well as the larger New York–Newark–Bridgeport, New York–New Jersey–Connecticut–Pennsylvania Combined Statistical Area.