Washington State Route 8

State Route 8
SR 8 highlighted in red
Route information
Maintained by WSDOT
Length	20.67 mi[1] (33.27 km)
Existed	1964[2]–present
Major junctions
West end	US 12 in Elma
Major intersections	SR 108 in McCleary
East end	US 101 near Olympia
Location
Country	United States
State	Washington
Counties	Grays Harbor, Thurston
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 7 → SR 9

State Route 8 (SR 8) is a state highway in Grays Harbor and Thurston counties, of the U.S. state of Washington. It extends 20.67 miles (33.27 km) from U.S. Route 12 (US 12) in the city of Elma, east to an interchange with US 101 about 5.90 miles (9.50 km) northwest of the state capital, Olympia. SR 8 intersects SR 108 west of McCleary. The route connects Elma and Olympia as part of a corridor between Aberdeen and the Puget Sound region.

The highway was part of the Elma – Grand Mound branch of Primary State Highway 9 (PSH 9 EG) from 1937 until 1964, which ran from Elma southeast to Interstate 5 (I-5), formerly US 99 in Grand Mound, which was later added as part of US 12 in 1967. The road also forms the northern boundary of Capitol State Forest in Thurston County.