PA 412 begins at an intersection with
PA 611 in the community of
Harrow in
Nockamixon Township,
Bucks County, heading northwest on two-lane undivided Durham Road. The road passes through farmland with some homes and businesses, coming to an intersection with the northern terminus of
PA 563. The route continues through a mix of farmland and woodland with some development, passing through
Bucksville and heading to the southwest of
Palisades High School. PA 412 enters
Springfield Township and becomes an unnamed road, passing through
Gallows Hill. The road winds northwest through more rural areas and comes to an intersection with
PA 212. At this point, PA 412 turns west to join PA 212 in a
concurrency, heading through forests and fields and crossing
Cooks Creek before passing through the residential community of
Springtown as Main Street. The road curves southwest and heads back into rural areas as an unnamed road. PA 412 splits from PA 212 by turning west onto Hellertown Road, passing through farmland and woodland. The route enters
Lower Saucon Township in
Northampton County, which is in the
Lehigh Valley, becoming Leithsville Road and running through more rural areas. The road turns north at the community of Leithsville and passes through woodland with homes and commercial establishments. PA 412 enters the borough of
Hellertown and becomes Main Street, a three-lane road with a
center left-turn lane that runs past businesses. The route becomes two lanes again and becomes lined with homes with a few businesses as it continues north through Hellertown. The road becomes the border between Hellertown to the west and the city of
Bethlehem to the east as it comes to an interchange with
I-78. A
park and ride lot is located west of the road at this interchange. ==History==