| Place Name | Sleepy Hollow |
| Place Type | Census Designated Place |
| ZIP Code(s) | 82718 |
| County | Campbell County |
| Area Code(s) | 307 |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2022) | 1,112 |
| Population Growth Rate (2010-19) | -6.19% |
| Majority Ethnicity | White 83.62% |
| Metro/Micro Stats Area | Gillette, WY |
| US Congressional District(s) | Wyoming At-Large |
| State House Districts | 31 |
| State Senate Districts | 23 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 83.62% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 16.38% |