
Columbia County
- State:
- Pennsylvania
- County Seat:
- Bloomsburg
Columbia County's estimated 2025 population is 65,739 with a growth rate of 0.23% in the past year according to the most recent United States census data. Columbia County is the 38th largest county in Pennsylvania. The 2010 population was 67,355 and has seen a growth of -2.4% since that time.