Dunnstown is a census-designated place (CDP) in Clinton County, Pennsylvania, United States.

[3] Dunnstown is located in eastern Clinton County at 41°8′47″N 77°25′21″W / 41.14639°N 77.42250°W / 41.14639; -77.42250 (41.146498, -77.422450),[4] in the southeastern corner of Woodward Township.

It is on the north bank of the West Branch Susquehanna River, and Pennsylvania Route 150 (Woodward Avenue) crosses the river from the southwest corner of Dunnstown into the city of Lock Haven, the county seat.

PA 150 leads east 6 miles (10 km) to the borough of Avis.

Pennsylvania Route 664 leads north from Dunnstown 16 miles (26 km) to Haneyville.