The route at the southern terminus became PA 612 in the 1930s before PA 402 was extended south to US 611 (now PA 611 in Delaware Water Gap in the 1940s, replacing a portion of PA 612.
In the 1930s, the route at the southern terminus became PA 612. Later, in the 1940s, PA 402 was extended south to US 611 (now PA 611), replacing a portion of PA 612.