Martinez city, California
Official LSAD Designation: Martinez city • Census GEOID: 0646114
• Contra Costa County
Demographics & Population Profile
Population and demographics for Martinez city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 36,849 | — | 2025 | Census |
| Median Age | 42.6 yrs | ±1.1 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 14,723 | ±484 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).