Emerson is a borough in Bergen County, in the U.S. state of New Jersey, a suburb in the New York City metropolitan area. Emerson is the most southern municipality in an area of the county known as the Pascack Valley. As of the 2020 United States census, the borough's population was 7,290, a decrease of 111 from the 2010 census count of 7,401, which in turn reflected an increase of 204 from the 7,197 counted in the 2000 census.