
Larimer County
- State:
- Colorado
- County Seat:
- Fort Collins
Larimer County's estimated 2025 population is 377,159 with a growth rate of 0.85% in the past year according to the most recent United States census data. Larimer County is the 8th largest county in Colorado. The 2010 population was 300,453 and has seen a growth of 25.53% since that time.