 The road crosses into Upper Frederick Township, where it heads through rural land with residences and runs through Frederick and Obelisk.The route continues into Lower Frederick Township and passes through farmland with some development before it reaches a roundabout at PA 29 in the community of Zieglerville.Here, PA 73 turns southeast to join PA 29 on Gravel Pike, running through wooded areas with some homes and crossing Swamp Creek.