Northfield is a city in Atlantic County, in the U.S. state of New Jersey. As of the 2020 United States census, the city's population was 8,434, a de…Northfield is a city in Atlantic County, in the U.S. state of New Jersey. As of the 2020 United States census, the city's population was 8,434, a decrease of 190 from the 2010 census count of 8,624, which in turn reflected an increase of 899 from the 7,725 counted in the 2000 census.
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