Pennsylvania Route 233 is a 53-mile-long (85 km) north–south state highway in south central Pennsylvania. It runs from PA 997 in Mont Alto north to PA 274 in Green Park. PA 233 heads northeast from Mont Alto through forested areas in the South Mountain range, where it runs through Mont Alto and Caledonia state parks and has an intersection with U.S. Route 30. After heading northwest out of the mountains, the route continues into the agricultural Cumberland Valley, where it intersects Interstate 81 (I-81) and US 11 and crosses PA 641 in Newville. PA 233 crosses Blue Mountain into Perry County near Colonel Denning State Park and heads northeast to Landisburg, where it intersects PA 850 and turns north to continue to its terminus.

Pennsylvania Route 997 is a 49.0-mile (78.9 km) route that is located in Franklin and Cumberland counties in central Pennsylvania in the United States. This route runs from the Maryland state line south of Waynesboro, where the road continues into that state as Maryland Route 64, north to PA 233 in the Upper Mifflin Township community of McCrea.