Mont Alto
- County:
- Franklin County
- County Seat:
- No
- Area (mi²):
- 0.563
- State:
- Pennsylvania
Mont Alto is a borough located in Franklin County, Pennsylvania. Mont Alto has a 2026 population of 1,563. Mont Alto is currently declining at a rate of -0.19% annually and its population has decreased by -0.76% since the most recent census, which recorded a population of 1,575 in 2020.