Hartleton
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 0.908
- State:
- Pennsylvania
Hartleton is a borough located in Union County, Pennsylvania. Hartleton has a 2026 population of 248. Hartleton is currently declining at a rate of -0.8% annually and its population has decreased by -1.2% since the most recent census, which recorded a population of 251 in 2020.