| Place Name | Williamstown |
| Place Type | Borough |
| ZIP Code(s) | 17098 |
| County | Dauphin County |
| Area Code(s) | 717 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 1,232 |
| Population Growth Rate (2010-19) | -6.06% |
| Majority Ethnicity | White 90.59% |
| Metro/Micro Stats Area | Harrisburg-Carlisle, PA |
| US Congressional District(s) | Pennsylvania 11th |
| State House Districts | 125 |
| State Senate Districts | 15 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 90.59% |
| African American | 1.51% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 7.9% |