Keyport is a borough in Monmouth County, New Jersey, United States. At the 2010 United States Census, the borough's population was 7,240, following a decline of 328 (-4.3%) from the 7,568 counted in the 2000 Census, which had in turn declined by 18 (-0.2%) from the 7,586 counted in the 1990 Census. Keyport's nickname is the Pearl of the Bayshore or the Gateway to the Bayshore. Keyport was originally formed as a Town on March 17, 1870, from portions of Raritan Township (now Hazlet). On April 2, 1908, the Borough of Keyport was formed, replacing Keyport Town.