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Demarest is a borough in Bergen County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 4,981, an increase of 100 (+2.0%) from the 2010 census count of 4,881, which in turn reflected an increase of 36 (+0.7%) from the 4,845 counted in the 2000 census.
Source: Wikipedia