Ridgefield 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 11,501, an increase of 469 (+4.3%) from the 2010 census count of 11,032, which in turn reflected an increase of 202 (+1.9%) from the 10,830 counted in the 2000 census.