State Road No. 4 Tonasket-Sanpoil Highway began at Jct State Road 10 in Tonasket and headed east to Republic, then south, ending at Jct State Road No. 2 Sunset Highway near Wilbur. This highway was redesignated in 1937 as Primary State Highway 4.
State Road No. 4 had no branches.
Primary State Hwys Secondary State Hwys
State Roads 1923-37