Mainwaring, William L. Share: Individuals Mainwaring, William L. Request Info 1090 Southridge Pl S Salem, OR 97302 (503) 363-2422 Rep Info Map Whom to Contact William Mainwaring 1090 Southridge Pl S Salem, OR 97302 What's Nearby? Distance: 5 10 15 20 25 50 mi.