
Blair County
- State:
- Pennsylvania
- County Seat:
- Hollidaysburg
Blair County's estimated 2025 population is 119,351 with a growth rate of -0.38% in the past year according to the most recent United States census data. Blair County is the 28th largest county in Pennsylvania. The 2010 population was 127,049 and has seen a growth of -6.06% since that time.