Bergenfield 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 28,321, an increase of 1,557 from the 2010 census count of 26,764, which in turn reflected an increase of 517 from the 26,247 counted in the 2000 census. New Jersey Monthly magazine ranked Bergenfield as its 211th best place to live in its 2010 rankings of the "Best Places To Live" in New Jersey.