| Place Name | Harper |
| Place Type | Census Designated Place |
| ZIP Code(s) | 97906 |
| County | Malheur County |
| Area Code(s) | 458,541 |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2022) | 133 |
| Population Growth Rate (2010-19) | 3.67% |
| Majority Ethnicity | White 97.54% |
| Metro/Micro Stats Area | Ontario, OR-ID |
| US Congressional District(s) | Oregon 2nd |
| State House Districts | 60 |
| State Senate Districts | 30 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.54% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.46% |