| Place Name | Williamstown |
| Place Type | Census Designated Place |
| ZIP Code(s) | 08094 |
| County | Gloucester County |
| Area Code(s) | 856 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 15,256 |
| Population Growth Rate (2010-19) | -3.12% |
| Majority Ethnicity | White 82.57% |
| Metro/Micro Stats Area | Philadelphia-Camden-Wilmington, PA-NJ-DE-MD |
| US Congressional District(s) | New Jersey 1st |
| State Assembly Districts | 4 |
| State Senate Districts | 4 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 82.57% |
| African American | 10.09% |
| Hispanic | 0% |
| Asian | 1.39% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 5.94% |