what county is demarest nj
Demarest, New Jersey. Demarest is a borough in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 4,881, reflecting an increase of 36 (+0.7%) from the 4,845 counted in the 2000 Census, which had in turn increased by 45 (+0.9%) from the 4,800 counted in the 1990 Census.