| Place Name | Vassar |
| Place Type | Census Designated Place |
| ZIP Code(s) | 66543 |
| County | Osage County |
| Area Code(s) | 785 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 559 |
| Population Growth Rate (2010-19) | 10.19% |
| Majority Ethnicity | White 97.65% |
| Metro/Micro Stats Area | Topeka, KS |
| US Congressional District(s) | Kansas 2nd |
| State House Districts | 59 |
| State Senate Districts | 19 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.65% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.35% |