Keansburg is a borough in Monmouth County, in the U.S. state of New Jersey. At the 2020 United States census, its population was 9,755, a drop of 350 from the 2010 census enumeration of 10,105, in tur…Keansburg is a borough in Monmouth County, in the U.S. state of New Jersey. At the 2020 United States census, its population was 9,755, a drop of 350 from the 2010 census enumeration of 10,105, in turn a decline of 627 from 10,732 in the 2000 Census.
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