Fairfield, NJ is a city located in Essex County, New Jersey and has a land area of 10.13 square miles (26.24 km2). The water area for the city is 0.22 square miles or 0.57 km2. There is one unique zip code in Fairfield, New Jersey and it is 07004. The area code(s) for Fairfield is 973/201/862.
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