High Quality Content by WIKIPEDIA articles! State Route 530 (SR 530) is a Washington state highway in Snohomish and Skagit counties. The 50.52-mile (81.30 km) long route runs northeast from an interchange with Interstate 5 (I-5) southwest of Arlington past SR 9 in Arlington and Darrington to end at SR 20 in Rockport. Serving the commuinities of Arlington, Arlington Heights, Oso, Darrington and Rockport, the roadway travels parallel to a fork of the Stillaguamish River from Arlington to Darrington, the Sauk River from Darrington to Rockport and a BNSF Railway route that extends from Arlington to Cicero, located west of Oso.