Williamsport is a city located in the state of Pennsylvania within the United States. It serves as the county seat for Lycoming County. As of the 2020 census, the city had a population of 27,754 residents.
The city functions as the principal city of the Williamsport Metropolitan Statistical Area, which has a total population of approximately 114,000. Additionally, Williamsport is the larger principal city of the Williamsport-Lock Haven Combined Statistical Area, an area encompassing both Lycoming and Clinton counties.