Allegheny Outdoor Club — This hiking club leads hikes in northwest Pennsylvania. Their website lists upcoming hikes as well as scheduled trail maintenance.

Source: Allegheny Outdoor Club – PAHikes

Susquehanna Appalachian Trail Club — A hiking club for the Harrisburg, Pennsylvania region. This club maintains 20 miles of the Appalachian trail plus many other trails around Harrisburg.

Source: Susquehanna Appalachian Trail Club – PAHikes

Lancaster Hiking Club — A hiking club for the Lancaster, Pennsylvania region that provides a program for outdoor recreation and maintaining the Conestoga Trail.

Source: Lancaster Hiking Club – PAHikes

The Alpine Club of Williamsport — Formed in 1953 to help maintain the Loyalsock Trail, this club still has work hikes during the spring as well as monthly outings for hikes through out Northeastern Pennsylvania

Source: The Alpine Club of Williamsport – PAHikes