Muncy Township, named for the Munsee tribe, was the first township in the county north of the West Branch Susquehanna River to be formed (predating even Lycoming County itself). Muncy Township, as one of the seven original townships of Northumberland County, was once an immense township. It had an indefinite northern border. The southern border of the township was the West Branch Susquehanna River. The eastern boundary may have been Muncy Creek, and the western boundary was, like the northern boundary, indefinite. Loyalsock Township was the first township to be formed from Muncy Township, in 1786. This division encompassed the land between Loyalsock and Lycoming creeks. The township was divided several more times.

Muncy Township has a rich history. More history can be found here:
https://en.wikipedia.org/wiki/Muncy_Township,_Lycoming_County,_Pennsylvania