
Mariposa County
- State:
- California
- County Seat:
- Mariposa
Mariposa County's estimated 2025 population is 16,651 with a growth rate of -0.8% in the past year according to the most recent United States census data. Mariposa County is the 53rd largest county in California. The 2010 population was 18,302 and has seen a growth of -9.02% since that time.