the first change to pa 39's routing came in the 1940s. during this time, u.s. route 22 was rerouted through dauphin and lebanon county to follow allentown boulevard instead of jonestown road. as a result, pa 39 was extended a short distance southward along lr 22006 on what is now jonestown road, harper drive, and hershey road to meet the new alignment of us 22 south of manadahill. this section of pa 39 was rerouted in 1969 when a new road was constructed between jonestown road and manada view drive which directly connected linglestown road to hershey road. the alignment on jonestown road and what became harper drive was deleted.