- Southern Terminus:
- Lehigh Valley Thruway (US 22) in Bethlehem
- Northern Terminus:
- North Delaware Drive (PA 611) in Mount Bethel
- 26.13 miles
PA 512 is a quarter-circle route in the Lehigh Valley and the Poconos. It begins at the Lehigh Valley Thruway (US 22) in Bethlehem and runs north along Bath Pike to Bath. There, it curves to the northeast to reach Wind Gap, where there is an interchange with the PA 33 expressway. It continues northeast to Mount Bethel, where it ends at North Delaware Drive (PA 611), a little over a mile away from the Delaware River.