The Banks–Vernonia State Trail is a paved rail trail and state park in northwest Oregon in the United States. It runs for 21 miles, primarily north–south, between the towns of Vernonia in Columbia County and Banks in Washington County on an abandoned railroad bed. Banks is about 25 miles west of Portland. The 8-foot wide trail is open to non-motorized uses such as hiking and biking. A 4-foot wide horse trail parallels the hiking and biking trail.