| Place Name | O'Brien |
| Place Type | Census Designated Place |
| ZIP Code(s) | 97523 97534 |
| County | Josephine County |
| Area Code(s) | 458,541 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 143 |
| Population Growth Rate (2010-19) | -6.75% |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Grants Pass, OR |
| US Congressional District(s) | Oregon 4th |
| State House Districts | 3 |
| State Senate Districts | 2 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |