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is a borough in Lycoming County, Pennsylvania, in the United States. As of the 2000 census, the borough population was 4,777. It is part of the Williamsport, Pennsylvania Metropolitan Statistical Area. It was named for Elizabeth Catherine Montour, a Native American leader and skilled translator for the colonial governments. The Williamsport Regional Airport is located in Montoursville.
Montoursville is bordered by the West Branch Susquehanna River and Armstrong Township to the south. Loyalsock Creek forms the northern and western border with Loyalsock Township. Fairfield Township borders the borough to the north and east. As the crow flies, Lycoming County is about northwest of Philadelphia and east-northeast of Pittsburgh.
According to the United States Census Bureau, the borough has a total area of 4.2 square miles (10.8 km²).4.0 square miles (10.5 km²) of it is land and 0.1 square miles (0.3 km²) of it (3.12%) is water.