Vernon Road was added to the reformed state highway system in 1937 as part of Secondary State Highway 15A (SSH 15A), connecting Primary State Highway 15 (PSH 15) with SSH 1A in Lake Stevens and the city of Granite Falls.
In 1937, Vernon Road was integrated into the revamped state highway network as part of Secondary State Highway 15A (SSH 15A), bridging Primary State Highway 15 (PSH 15) with SSH 1A in Lake Stevens and Granite Falls municipality.