Keyport is a borough in northern Monmouth County, in the U.S. state of New Jersey. A waterfront community located on the Raritan Bay in the Raritan Valley region, the borough is a commuter town of New York City in the New York metropolitan area. As of the 2020 United States census, the borough's population was 7,204, a decrease of 36 from the 2010 census count of 7,240, which in turn reflected a decline of 328 from the 7,568 counted in the 2000 census.