
Lehigh County
- State:
- Pennsylvania
- County Seat:
- Allentown
Lehigh County's estimated 2025 population is 380,714 with a growth rate of 0.39% in the past year according to the most recent United States census data. Lehigh County is the 10th largest county in Pennsylvania. The 2010 population was 350,008 and has seen a growth of 8.77% since that time.