DuPont is a city in Pierce County, Washington, United States. The population was 8,199 at the 2010 census. The Nisqually tribe arrived in the area at least 5700 years ago, subsisting on shellfish from the beaches and salmon from Sequalitchew Creek. Captain George Vancouver mapped the area in 1792, and in 1833, the Hudson's Bay Company established a fur trading post at Fort Nisqually. The fort was relocated upstream in 1843. In 1906, E.I. du Pont de Nemours and Co. acquired the property from a variety of owners and became the company town for The DuPont Company manufacturing dynamite and other explosives. Today the City of DuPont is listed in the National Register of Historic Places as the only former company town in the state in which most of the homes maintain historic integrity.