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Neptune City is a borough in Monmouth County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 4,626, a decrease of 244 (−5.0%) from the 2010 census count of 4,869, which in turn reflected a decline of 349 (−6.7%) from the 5,218 counted in the 2000 census.