
Humboldt County
- State:
- California
- County Seat:
- Eureka
Humboldt County's estimated 2025 population is 132,067 with a growth rate of -0.72% in the past year according to the most recent United States census data. Humboldt County is the 34th largest county in California. The 2010 population was 135,010 and has seen a growth of -2.18% since that time.