The City of Passaic is located in the southeastern portion of Passaic County, New Jersey. Its 3.2 square miles of area contains mixed industrial, commercial, and residential land uses developed at a population density of 21,207 persons per square mile. According to the 2000 Census, the City has a population of 67,861. Tracing its development from the 19th Century, Passaic is a mature community which has experienced the in and out migration of several ethnic groups, and a slow but steady population growth over the last two decades. Currently, the City is almost totally developed.