
South Williamsport
- County:
- Lycoming County
- County Seat:
- No
- Area (mi²):
- 1.899
- State:
- Pennsylvania
South Williamsport is a borough located in Lycoming County, Pennsylvania. South Williamsport has a 2025 population of 6,106. South Williamsport is currently declining at a rate of -0.49% annually and its population has decreased by -2.4% since the most recent census, which recorded a population of 6,256 in 2020.
The average household income in South Williamsport is $95,010 with a poverty rate of 9.52%. The median age in South Williamsport is 42.4 years: 39.1 years for males, and 43 years for females.