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Fairfield is a township in far northwestern Essex County, New Jersey, United States. As of the 2010 United States Census, the township's population was 7,466, reflecting an increase of 403 (+5.7%) from the 7,063 counted in the 2000 Census, which had in turn declined by 552 (−7.2%) from the 7,615 counted in the 1990 Census. Fairfield is the least densely populated town in Essex County.