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(; ) is a city in Clallam County, Washington, United States. The population is estimated to be 5,951 as of 2007, not including the approximately 20,000 residents in the Dungeness Valley immediately surrounding the city limits. Sequim is located along the Dungeness River near the base of the Olympic Mountains. The city has been increasing in population dramatically in recent years due to the influx of retirees from the Puget Sound region and California. Recent approximations show a population growth of about 34% since the year 2000.
The city and the surrounding area are particularly known for their production of lavender, as the unique climate allows a commercial growth industry that is rivaled only in France. Sequim holds the title of the "Lavender Capital of North America." The area is also known for its Dungeness crab. Sequim lies within the rainshadow of the Olympic Mountains and receives an average of less than 15 inches of rain per year, nearly qualifying it as a desert. Fogs and cool breezes from the Juan de Fuca Strait make Sequim's environment more humid than would be expected from the low average annual precipitation. Historically, the area was an open garry oak prairie, with scattered Douglas fir and western red cedar. Agriculture and development of the Dungeness valley, however, have changed this ecosystem.
According to the United States Census Bureau, the city has a total area of 5.3 square miles (13.7 km²), all of it land.