PA 662 begins at an intersection with US 422 in the community of Douglassville in Amity Township, Berks County.

The two routes pass a few businesses in Oley, bypassing the residential center of the community to the southwest, before heading into areas of farms and woods.

The road leaves the Oley Valley and heads northwest and then north over a wooded mountain prior to coming to the community of Pricetown.

After crossing the mountain, the route heads north into the borough of Fleetwood, where it becomes South Richmond Street and passes through residential areas.

After crossing Norfolk Southern's Reading Line at-grade, the route turns east onto West Main Street and enters the commercial downtown of Fleetwood.

PA 662 heads northwest through agricultural areas prior to reaching a roundabout with US 222 near businesses in the community of Moselem Springs.

[2][3] Following the roundabout at US 222, the route heads through more farmland prior to passing a golf course and reaching an intersection with the southern terminus of PA 143.

At this point, PA 662 turns west into woodland, crossing the Maiden Creek into Perry Township.

Upon entering Perry Township, the road heads into farmland, passing through a sharp S-curve to the north and west.

[5] By 1928, what would become PA 662 was paved between Douglassville and Yellow House, in the Oley area, and between Pricetown and Moselem Springs.