San Diego County Flag

San Diego County

State:
California
County Seat:
San Diego

San Diego County's estimated 2026 population is 3,324,617 with a growth rate of 0.39% in the past year according to the most recent United States census data. San Diego County is the 2nd largest county in California. The 2010 population was 3,103,260 and has seen a growth of 7.13% since that time.

3,324,617
Total Population
790
Population Density (mi²)
2
Population Rank (State)
12.9K 0.39%
Annual Population Growth

San Diego County Population

Demographics

Economics and Income Statistics