Wallington 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 11,868, an increase of 533 from the 2010 census count of 11,335, which in turn reflected a decline of 248 from the 11,583 counted in the 2000 census. Wallington was created as a borough on January 2, 1895, based on a referendum held on December 31, 1894, from area taken from Bergen Township and Saddle River Township.