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. 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).