Sligo
- County:
- Clarion County
- County Seat:
- No
- Area (mi²):
- 1.407
- State:
- Pennsylvania
Sligo is a borough located in Clarion County, Pennsylvania. Sligo has a 2026 population of 671. Sligo is currently declining at a rate of -0.45% annually and its population has decreased by -1.32% since the most recent census, which recorded a population of 680 in 2020.