Carteret is a borough in Middlesex County, New Jersey, United States. As of the United States 2000 Census, the borough population was 20,709. What is now Carteret was originally created as the borough of Roosevelt on April 11, 1906, from portions of Woodbridge Township, based on the results of a referendum approved on May 22, 1906. The name was changed to Carteret as of November 7, 1922. The borough was also called Carteret during the period from December 19, 1921, to January 16, 1922.