South River borough, New Jersey
Official LSAD Designation: South River borough • Census GEOID: 3469420
• Middlesex County
Demographics & Population Profile
Population and demographics for South River borough.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 16,262 | — | 2025 | Census |
| Median Age | 37 yrs | ±2.8 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 5,574 | ±300 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).