PA 233 heads into Cumberland County and becomes Centerville Road, briefly passing through Southampton Township and South Newton Township before continuing into Cooke Township. The road runs through more mountainous areas of Michaux State Forest, passing near Pine Grove Furnace State Park before reaching the community of Pine Grove Furnace, where it crosses the Appalachian Trail again. At this point, the route turns to the north and runs through more rural areas, turning northwest to leave the state forest and continue through more forested areas.
PA 233 enters Cumberland County and becomes Centerville Road, passing through Southampton Township and South Newton Township before entering Cooke Township. The road navigates Michaux State Forest's rugged terrain, near Pine Grove Furnace State Park, before reaching the community of Pine Grove Furnace, where it intersects with the Appalachian Trail once more. At this juncture, the route shifts direction, heading northward through rural areas and eventually exiting the state forest to continue through more wooded regions.