| Place Name | Williamsville |
| Place Type | Village |
| ZIP Code(s) | 62693 |
| County | Sangamon County |
| Area Code(s) | 217 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 1,530 |
| Population Growth Rate (2010-19) | -3.46% |
| Majority Ethnicity | White 95.9% |
| Metro/Micro Stats Area | Springfield, IL |
| US Congressional District(s) | Illinois 18th |
| State House Districts | 87 |
| State Senate Districts | 44 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.9% |
| African American | 1.55% |
| Hispanic | 0% |
| Asian | 0.71% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 1.84% |