SR 20 is a state route located in the U.S. state of Washington. It runs approximately 140 miles, connecting the towns of Anacortes and Colville. The route traverses diverse landscapes, including mountains, forests, and farmland. This scenic highway is popular for its beautiful views and access to outdoor activities. It passes through several communities, providing vital connections for residents and travelers. SR 20 is also part of the North Cascades Scenic Highway, which showcases the natural beauty of the North Cascades National Park.