| Place Name | Williamstown |
| Place Type | Census Designated Place |
| ZIP Code(s) | 66073 |
| County | Jefferson County |
| Area Code(s) | 785 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 129 |
| Majority Ethnicity | White 77.27% |
| Metro/Micro Stats Area | Topeka, KS |
| US Congressional District(s) | Kansas 2nd |
| State House Districts | 47 |
| State Senate Districts | 2 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.27% |
| African American | 0% |
| Hispanic | 22.73% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |