North Central Pennsylvania Group (formerly Otzinachson) is a regional group of the Sierra Club and currently has approximately 800 members. The group encompasses an eleven-county area of Clinton, Columbia, Lycoming, Montour, Northumberland, Snyder, Tioga, Union, and parts of Bradford, Potter, and Sullivan counties. Inspired by nature, the North Central PA Group works to protect our communities and the earth through environmental advocacy and education. An active hiking club with local, state, and national environmental interests, North Central PA hosts many events that include biking, hiking, films, and educational programs. Look at our calendar to see upcoming activities — all events are open to the public.