1964 state highway renumbering (Washington)

1964 state highway renumbering
Highway names
Interstates	Interstate X (I-X)
US Highways	U.S. Route X (US X)
State	State Route X (SR x)
System links
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former

The 1964 state highway renumbering was a reorganization of state highways in the U.S. state of Washington. The new system, based on sign routes (SR, later changed to state routes), replaced the primary and secondary highway system implemented in 1937. It was first signed in January 1964 and codified into the Revised Code of Washington in 1970.