High Quality Content by WIKIPEDIA articles! State Route 512 (SR 512) is a 12.06-mile (19.41 km) long state-maintained freeway serving southern Pierce County in the U.S. state of Washington. The freeway begins at a partial cloverleaf interchange with Interstate 5 (I-5) in Lakewood and travels east past SR 7 in Parkland and a concurrency with SR 161 to a trumpet interchange with SR 167 and SR 161 in Puyallup.