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Edgewater is a borough located along the Hudson River in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough had a population of 11,513, reflecting an increase of 3,836 (+50.0%) from the 7,677 counted in the 2000 Census, which had in turn increased by 2,676 (+53.5%) from the 5,001 counted in the 1990 Census.The borough's history has featured the founding of the first colony in Bergen County, contribution to the Revolutionary War, a period as a "sleepy, pastoral little town" with resort hotels in the 19th century, industrialization in the early 20th century, and a transition to a rapidly growing residential community in the late 20th century.Edgewater was incorporated as a municipality on December 7, 1894, from portions of Ridgefield Township as the Borough of Undercliff, based on the results of a referendum that passed two days earlier.