
Riverside County
- State:
- California
- County Seat:
- Riverside
Riverside County's estimated 2025 population is 2,528,844 with a growth rate of 0.72% in the past year according to the most recent United States census data. Riverside County is the 4th largest county in California. The 2010 population was 2,201,562 and has seen a growth of 14.87% since that time.