where is ridgefield nj?
Ridgefield, New Jersey. Ridgefield is a borough in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 11,032, reflecting an increase of 202 (+1.9%) from the 10,830 counted in the 2000 Census, which had in turn increased by 834 (+8.3%) from the 9,996 counted in the 1990 Census.