Muncy is a borough in Lycoming County, Pennsylvania, United States. The name Muncy comes from the Munsee Indians who once lived in the area. The population was 2,442 at the 2020 census. It is part of the Williamsport, Pennsylvania, Metropolitan Statistical Area. Muncy is located on the West Branch Susquehanna River, just south of the confluence of Muncy Creek with the river. Currently the borough president is Bill Scott and the mayor is Jon Ort.