Nooksack is a city in Whatcom County, Washington, United Sates, 8 km south of the border with Canada. The population was 1,471 at the 2020 census. Despite the name, it is actually located right next to the upper stream of the Sumas River, and is 2 km northeast of the nearest bank of the Nooksack River. Nooksack shares Nooksack Valley School District with the nearby Sumas and Everson, and contracts for police and sewer services through the City of Everson. State Route 9 runs through Nooksack.