New Castle city, Delaware
Official LSAD Designation: New Castle city • Census GEOID: 1050800
• New Castle County
Demographics & Population Profile
Population and demographics for New Castle city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 5,726 | — | 2025 | Census |
| Median Age | 48.5 yrs | ±5.9 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 2,774 | ±203 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).