Mountain Lakes is a borough in Morris County, New Jersey, United States, and a suburb of New York City. As of the 2010 United States Census…Mountain Lakes is a borough in Morris County, New Jersey, United States, and a suburb of New York City. As of the 2010 United States Census, the borough's population was 4,160, reflecting a decline of 96 from the 4,256 counted in the 2000 Census, which had in turn increased by 409 from the 3,847 counted in the 1990 Census.
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