Clifton is a city in Passaic County, New Jersey, United States. As of the United States 2000 Census, the city had a total population of 78,672. Clifton was incorporated as a city by an Act of the New Jersey Legislature on April 26, 1917, replacing Acquackanonk Township, based on the results of a referendum held two days earlier. Clifton is listed under five different zip codes (07011, 07012, 07013, 07014, 07015).