Wellersburg
- County:
- Somerset County
- County Seat:
- No
- Area (mi²):
- 0.81
- State:
- Pennsylvania
Wellersburg is a borough located in Somerset County, Pennsylvania. Wellersburg has a 2026 population of 207. Wellersburg is currently declining at a rate of -0.96% annually and its population has decreased by -3.27% since the most recent census, which recorded a population of 214 in 2020.