Blaine is a city in Whatcom County, Washington, United States. The city's northern boundary is the Canadian border. Blaine is the shared home of the Peace Arch international monument. The population was 3,770 at the 2000 census.
Much of Blaine's economy is based on trade across the Canadian border. The eastern side of the city accommodates a number of import/export warehouses, freight and courier services and gas stations serving long haul cargo trucks. The Customs and Border Protection branch of the Department of Homeland Security operates two border inspection stations in Blaine. The Blaine Sector Headquarters of the US Border Patrol employs hundreds of federal law enforcement officers and support staff in the community.
Blaine also includes a number of manufacturing companies, including Nature's Path Cereal plant and Totally Chocolate.
The Port of Bellingham operates a large marina 1 km south of the border, serving a variety of pleasure craft and fishing vessels.