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Glen Rock 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 12,133, an increase of 532 (+4.6%) from the 2010 census count of 11,601, which in turn reflected an increase of 55 (+0.5%) from the 11,546 counted in the 2000 census.
Source: Wikipedia