Washington State Route 169

State Route 169
SR 169 highlighted in red
Route information
Maintained by WSDOT
Length	25.26 mi[1] (40.65 km)
Existed	1964–present
Major junctions
South end	SR 164 in Enumclaw
Major intersections	SR 516 in Maple Valley I-405 in Renton
North end	SR 900 in Renton
Location
Country	United States
State	Washington
County	King
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 168 → SR 170

State Route 169 (SR 169) is a state highway in the U.S. state of Washington, located entirely within King County. It runs 25 miles (40 km) from Enumclaw to Renton, passing through Black Diamond and Maple Valley. The highway, also known as the Maple Valley Highway, functions as a major rural and suburban route for the southeastern Seattle metropolitan area and connects several highways, including SR 410, SR 18, and Interstate 405 (I-405).

The Enumclaw–Maple Valley–Renton highway was built in 1914 and expanded in the early 1930s by the county government. It was absorbed into the state highway system in 1937 and designated as a branch of Primary State Highway 5 and renumbered to SR 169 in 1964. Recent residential development in Maple Valley and surrounding areas has increased traffic congestion on the highway, leading to a series of widening and improvement projects funded primarily by city governments.