Sequim /ˈskwɪm/ is a city in Clallam County, Washington, United States. As of the 2010 census counted a population of 6,606. [Sequim School District population served is a little over 29,000. Sequim and the area around Sequim has a population of about 28,000] Sequim is located along the Dungeness River near the base of the Olympic Mountains.