Clinton is a community and census-designated place located on southern Whidbey Island in Island County, Washington, United States. As of the 2020 census, the population was 956. The local post office, however, serves approximately 2,500 people in surrounding areas. Clinton is the western terminus of the Mukilteo–Clinton ferry operated by Washington State Ferries, which serves Whidbey Island. The ferry carries State Route 525, which continues through Clinton to the rest of Whidbey Island.