From here, the route becomes an unnamed road and winds northeast through a mix of fields and woods, crossing over Mahoning Creek.

The road makes a turn to the west and heads through more rural areas, running through McWilliams.

The route heads northwest before turning west into Mahoning Township and passing through areas of agriculture.

PA 839 heads north into forested areas, where it makes a sharp turn to the west.

The route enters the borough of South Bethlehem and continues north along Putneyville Road, passing homes before reaching its terminus at PA 28/PA 66.