PA 77 enters Concord Township in Erie County and turns north as Spartansburg Highway, running through more farmland and woodland with some residences. The road runs through wooded areas with some fields and homes, passing to the west of Corry-Lawrence Airport as it crosses into the city of Corry. Here, the route becomes Union Street and passes through woods, turning east onto West Main Street and passing through industrial and business areas with some homes as it runs a short distance to the south of a Western New York and Pennsylvania Railroad line. PA 77 ends at an intersection with PA 426 in the commercial downtown of Corry, where the road continues east as East Main Street, which is a part of PA 426.