| Place Name | Williamson |
| Place Type | City |
| ZIP Code(s) | 50272 |
| County | Lucas County |
| Area Code(s) | 641 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 133 |
| Population Growth Rate (2010-19) | -21.05% |
| Majority Ethnicity | White 92.22% |
| US Congressional District(s) | Iowa 2nd |
| State House Districts | 28 |
| State Senate Districts | 14 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.22% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 7.78% |