For other places named 'Muncy', please see Muncy (disambiguation).
Muncy is a borough in Lycoming County, Pennsylvania, in the United States. The name Muncy comes from the Munsee Indians who once lived in the area. The population was 2,663 at the 2000 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.
About 1787, four brothers Silas, William, Benjamin, and Isaac McCarty, came here from Bucks County. They were of Quaker extraction. William and Benjamin bought 300 acres (120 ha) known as the "John Brady farm."