
Franklin County
- State:
- Pennsylvania
- County Seat:
- Chambersburg
Franklin County's estimated 2025 population is 159,660 with a growth rate of 0.57% in the past year according to the most recent United States census data. Franklin County is the 22nd largest county in Pennsylvania. The 2010 population was 149,925 and has seen a growth of 6.49% since that time.