| Place Name | O'Brien |
| Place Type | City |
| ZIP Code(s) | 79539 |
| County | Haskell County |
| Area Code(s) | 940 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 138 |
| Population Growth Rate (2010-19) | -14.15% |
| Majority Ethnicity | White 60.75% |
| US Congressional District(s) | Texas 19th |
| State House Districts | 68 |
| State Senate Districts | 28 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 60.75% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 39.25% |