 Downtown Arlington is located near the junction of State Route 9 and State Route 530, which serve as the main highways to the city.From Arlington, State Route 9 travels north into Skagit County and south to Snohomish; and State Route 530 travels west to an interchange with Interstate 5, the main north–south highway between Seattle and Vancouver, British Columbia, and east to Darrington.Within the city is an additional state highway, State Route 531, which connects Smokey Point, the municipal airport, and Gleneagle to Interstate 5 and State Route 9 in the southern part of the city.