| | Heppner, OR | Pendleton, OR | United States |
| Population | 1,214 | 16,861 | 329,725,481 |
| Female Population | 47.6% | 45.6% | 50.5% |
| Male Population | 52.4% | 54.4% | 49.5% |
| Median Age | 41.7 | 36.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,285 | 16,656 | 309,327,143 |
| Population - 2000 | 1,395 | 16,354 | 285,036,114 |
| Population - 1990 | 1,412 | 15,126 | 251,960,433 |
| Pop. 2000 to Now | -9.5% | 1.5% | 15.6% |
| Pop. 1990 to Now | -10.6% | 9.7% | 30.8% |
| space4 | | | |
| Population Density | 987.0 | 1,438.3 | 93.4 |
| Land Area | 1.2 | 11.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Heppner, OR | Pendleton, OR | United States |
| Age 0 to 4 | 2.3% | 7.5% | 5.9% |
| Age 5 to 9 | 9.1% | 6.1% | 6.1% |
| Age 10 to 14 | 10.4% | 7.0% | 6.6% |
| Age 15 to 17 | 3.7% | 4.1% | 3.9% |
| Age 18 to 20 | 1.4% | 4.5% | 4.0% |
| Age 21 to 24 | 7.9% | 3.7% | 5.2% |
| Age 25 to 34 | 7.7% | 14.1% | 13.8% |
| Age 35 to 44 | 13.3% | 14.0% | 12.9% |
| Age 45 to 54 | 6.8% | 11.0% | 12.6% |
| Age 55 to 59 | 4.0% | 5.8% | 6.7% |
| Age 60 to 64 | 8.2% | 5.5% | 6.3% |
| Age 65 to 74 | 13.3% | 10.4% | 9.6% |
| Age 75 to 84 | 10.2% | 3.6% | 4.5% |
| Age 85 and over | 1.6% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Heppner, OR | Pendleton, OR | United States |
| White | 89.6% | 78.4% | 59.4% |
| Black | 1.1% | 1.9% | 12.2% |
| Asian | 0.0% | 0.6% | 5.6% |
| Native American | 0.0% | 2.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.7% | 0.4% |
| Two or More Races | 3.6% | 4.2% | 3.2% |
| Hispanic | 5.7% | 12.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Heppner, OR | Pendleton, OR | United States |
| Married Population | 48.9% | 44.8% | 49.8% |
| Currently Married | 47.1% | 42.3% | 48.0% |
| Married but Separated | 1.9% | 2.6% | 1.8% |
| Single Population | 51.1% | 55.2% | 50.2% |
| Never Married | 28.9% | 33.7% | 33.8% |
| Divorced | 13.9% | 14.8% | 10.8% |
| Widowed | 8.2% | 6.7% | 5.6% |
| space5 | | | |
| Household Size | 2.32 | 2.57 | 2.60 |
| Households | 520 | 5,876 | 124,010,992 |
| Family Households | 303 | 3,555 | 80,755,759 |
| Married couple, w/children | 16.2% | 32.9% | 30.5% |
| Married couple, no children | 47.5% | 37.1% | 42.9% |
| Non Family Households | 217 | 2,321 | 43,255,233 |
| Single householder, w/children | 26.7% | 22.4% | 15.8% |
| Single householder, no children | 9.6% | 7.6% | 10.8% |