Waldwick 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 10,058, an increase of 433 (+4.5%) from the 2010 census count of 9,625, which in turn reflected an increase of three people (+0.0%) from the 9,622 counted in the 2000 census.

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