Diamond Bar city, California
Official LSAD Designation: Diamond Bar city • Census GEOID: 0619192
• Los Angeles County
Demographics & Population Profile
Population and demographics for Diamond Bar city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 51,884 | — | 2025 | Census |
| Median Age | 45.7 yrs | ±0.9 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 18,005 | ±559 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).