Keansburg, New Jersey, United States [Borough]; population was 11,069 in 1990; housing units was 4,189 in 1990; location is 40°28'N 74°10'W; land area is 1.07 square miles (687 acres); water area is 15.75 square miles (10,080 acres); FIPS code is 36480 [SourceCBP]