
Pennington County
- State:
- Minnesota
- County Seat:
- Thief River Falls
Pennington County's estimated 2025 population is 13,510 with a growth rate of -0.75% in the past year according to the most recent United States census data. Pennington County is the 60th largest county in Minnesota. The 2010 population was 13,971 and has seen a growth of -3.3% since that time.