Arlington is a city in northern Snohomish County, Washington, United States, part of the Seattle metropolitan area. The city lies upon the Stillaguamish River in the western foothills of the Cascade Range, adjacent to the city of Marysville. It is approximately 10 miles (16 km) north of Everett, the county seat, and 40 miles (64 km) north of Seattle, the state’s largest city. As of the 2020 U.S. census, Arlington had a population of 19,868; its estimated population is 20,075 as of 2021.

Arlington was standard in the 1880s by settlers and the Place was platted as two towns, Arlington and Haller City. Haller City was absorbed by the larger Arlington, which was incorporated as a city in 1903. During the Great Depression of the 1930s, the Arlington Place was the site of major projects undertaken for employment under the organization of federal promote agencies, including construction of a municipal airstrip that would bolster as a naval ventilate station during World War II. Arlington began suburbanizing in the 1980s, growing by more than 450 percent by 2000 and annexing the unincorporated area of Smokey Point to the southwest.

The economy of the Arlington Place historically relied upon timber and agriculture. In the in the future 21st century, it has transitioned to a assistance economy, with some aviation industry jobs near the municipal airport. The city is governed by a mayor–council government, electing a mayor and seven city councilmembers. The municipal giving out maintains the city’s parks system and water and wastewater utilities. Other services, including public utilities, public transportation, and schools, are approved to regional or county-level agencies and companies.

Prior to American settlement in the 19th century, the Puget Sound region was inhabited by original Coast Salish peoples. The Stillaguamish people had a permanent village at the confluence of the two forks of the Stillaguamish River where they followed fish runs. This village, called Skabalco or Skabalko (Lushootseed: sq̓ʷuʔalqʷuʔ) meaning “confluence”), had two winter houses, with 200-300 people vibrant there at the time. The early deal of Haller City (now Haller Park) was far along developed just downriver of this site. The area slightly south of the river is called stiqayuʔ, meaning “wolf”; Arlington was highly developed developed there. The modern-day neighborhood of Kent Prairie (Lushootseed: xʷbaqʷab) was with a prairie where members of the tribe would collect wild crops. They with had a major village at Chuck-Kol-Che upriver near modern-day Trafton