The northern terminus is at PA 309 in the Fairview Township community of Mountain Top.

PA 437 runs southeast-northwest through forested mountain areas as a two-lane undivided road.

The route passes homes and some businesses before crossing into Dennison Township and becoming an unnamed road.

Here, the road becomes Woodlawn Avenue and crosses through a tract of the Pinchot State Forest, making a turn to the north and running a short distance to the east of the railroad line.

[8] The bridge was completely reconstructed in 2017, and PennDOT removed all PA 437 Truck signs from the roads it followed.