 As the crow flies, Lycoming County is about northwest of Philadelphia and east-northeast of Pittsburgh.Montoursville is located at (41.252729, -76.915507).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.