| Place Name | Willow Lake |
| Place Type | Census Designated Place |
| ZIP Code(s) | 61032 |
| County | Stephenson County |
| Area Code(s) | 815,779 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 752 |
| Majority Ethnicity | White 95.22% |
| Metro/Micro Stats Area | Freeport, IL |
| US Congressional District(s) | Illinois 17th |
| State House Districts | 89 |
| State Senate Districts | 45 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 95.22% |
| African American | 4.78% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |