Arlington is a city in northern Snohomish County, Washington, United States, bordered by the city of Marysville to the south. The population was 11,713 at the 2000 census. The city owns the Arlington Municipal Airport, located three miles (5 km) southwest of Arlington, which is home to the annual Northwest EAA Fly-In. The city is also home to the Stillaguamish Valley Pioneer Museum. Its few industrial and manufacturing businesses are dispersed throughout portions of the city.