Washington State Route 512

State Route 512
Map of Pierce County in western Washington with SR 512 in red.
Route information
Maintained by WSDOT
Length	12.06 mi[1] (19.41 km)
Existed	1964–present
Major junctions
West end	I-5 in Lakewood
Major intersections	SR 7 in Parkland SR 161 in Puyallup
East end	SR 161 / SR 167 in Puyallup
Location
Country	United States
State	Washington
County	Pierce
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 510 → SR 513

State Route 512 (SR 512) is a suburban state-maintained freeway in Pierce County, Washington, United States. It travels 12 miles (19 km) from west to east, connecting Interstate 5 (I-5) in Lakewood to SR 7 in Parkland and SR 167 in Puyallup. The freeway travels north–south through Puyallup, concurrent with SR 161.

The freeway follows the route of several county roads that were incorporated into Secondary State Highway 5G (SSH 5G) in 1937. The highway was renumbered to SR 512 in 1964 and gradually replaced by a freeway that was constructed between 1959 and 1973. The Puyallup section was initially built as a two-lane expressway until further funding was allocated by the state government to complete it as a four-lane freeway in 1976.

Further projects widened sections of SR 512 and added new interchanges to address increased demand caused by urban development along the freeway. Recent proposals have included interchange upgrades and the addition of high-occupancy vehicle lanes (HOV lanes).