Lynden is the second largest city in Whatcom County, Washington, United States. Located within the Metropolitan Area of Bellingham. Named and established in 1874 near the site of the Nooksack Indian village Squahalish (Nooksack: Sqwehálich).
Lynden is approximately 5 miles (8.0 km) south of the Canada–US border, with Lynden-Aldergrove operation and port of entry hours between 8:00 a.m. and midnight. It is also located about 15 miles (24 km) north of Bellingham, and about 95 miles (153 km) north of Seattle. The population of Lynden is about 14,259 according to the United States Census Bureau. Residents of Lynden are known as "Lyndenites". Lynden is also home to the Northwest Washington Fair.