The route progresses eastward through the rural areas east of Nescopeck as Hobbie Road, entering the small community of Briggsville, made up mostly of farms.

Paralleling the creek, the highway crosses some power lines and heads westward through dense forests until reaching a switchback turn and enters Wapwallopen.

Through Wapwallopen, the highway turns northward, passing the rural community and paralleling the nearby Susquehanna River and Norfolk Southern's Sunbury Line.

PA 239 heads northward through a mix of woods and fields until following the riverbank of the Susquehanna and the railroad tracks directly.

The highway passes through mostly residences on the eastern side of the community before darting west on Main Street, which soon turns to the north again.

PA 239 continues on Main Street until passing under the Sunbury Line and crossing the Susquehanna River into the community of Dogtown, where it intersects with US 11.

The route crosses under power lines and enters the community of Koonsville, where the woodlands give way for a short time to residences.

After the intersection with Sunshine Road, PA 239 turns northwestward and leaves Koonsville for Union Township.

Progressing northwestward, the route passes Hillcrest Lake and turns westward through a stretch of sporadic residences.

After the intersection with Thorne Hill Road, PA 239 turns to the southwest, and then northwest through a small stretch of homes.

After passing the Hughes Mobile Home Park, PA 239 makes a long dive to the southwest through woodlands, entering the borough of Benton.

The dense forestry around Divide gives way back to fields and soon the reverse as the highway enters the hamlet of Lungerville.