| Place Name | Hennessey |
| Place Type | Town |
| ZIP Code(s) | 73742 |
| County | Kingfisher County |
| Area Code(s) | 405 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 2,712 |
| Population Growth Rate (2010-19) | 0.94% |
| Majority Ethnicity | White 75.37% |
| US Congressional District(s) | Oklahoma 3rd |
| State House Districts | 59 |
| State Senate Districts | 20 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 75.37% |
| African American | 0.28% |
| Hispanic | 0.83% |
| Asian | 0.49% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 23.03% |