PA 402 begins at a junction with US 209 Bus. (Milford Road or SR 2012) in the village of Marshalls Creek in Smithfield Township. PA 402 proceeds north along Resica Falls Road, leaving the village of Marshalls Creek after crossing the namesake tributary. Soon crossing into Middle Smithfield Township, PA 402 bends northeast, crossing south of White Heron Lake and through the lakeside residential area. At Oak Grove Drive, PA 402 bends northward again, passing a small pond and bypassing Pocono Highlands Lake after turning northeast at Coolbaugh Drive.