| | Union, OR | Amity, OR | United States |
| Population | 1,927 | 1,789 | 329,725,481 |
| Female Population | 49.7% | 51.5% | 50.5% |
| Male Population | 50.3% | 48.5% | 49.5% |
| Median Age | 42.1 | 36.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,113 | 1,607 | 309,327,143 |
| Population - 2000 | 1,926 | 1,478 | 285,036,114 |
| Population - 1990 | 1,847 | 1,175 | 251,960,433 |
| Pop. 2000 to Now | 14.6% | 16.5% | 15.6% |
| Pop. 1990 to Now | 19.5% | 46.6% | 30.8% |
| space4 | | | |
| Population Density | 774.2 | 2,966.8 | 93.4 |
| Land Area | 2.5 | 0.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Union, OR | Amity, OR | United States |
| Age 0 to 4 | 7.3% | 6.6% | 5.9% |
| Age 5 to 9 | 4.7% | 7.4% | 6.1% |
| Age 10 to 14 | 3.6% | 6.3% | 6.6% |
| Age 15 to 17 | 2.1% | 3.5% | 3.9% |
| Age 18 to 20 | 4.5% | 6.1% | 4.0% |
| Age 21 to 24 | 6.2% | 4.5% | 5.2% |
| Age 25 to 34 | 14.1% | 13.1% | 13.8% |
| Age 35 to 44 | 12.1% | 14.9% | 12.9% |
| Age 45 to 54 | 11.1% | 17.4% | 12.6% |
| Age 55 to 59 | 4.4% | 3.5% | 6.7% |
| Age 60 to 64 | 8.9% | 7.4% | 6.3% |
| Age 65 to 74 | 9.2% | 6.9% | 9.6% |
| Age 75 to 84 | 7.5% | 2.1% | 4.5% |
| Age 85 and over | 4.4% | 0.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Union, OR | Amity, OR | United States |
| White | 88.8% | 78.4% | 59.4% |
| Black | 3.3% | 0.0% | 12.2% |
| Asian | 1.7% | 0.4% | 5.6% |
| Native American | 1.4% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 1.0% | 0.4% |
| Two or More Races | 2.7% | 12.0% | 3.2% |
| Hispanic | 1.7% | 7.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Union, OR | Amity, OR | United States |
| Married Population | 53.6% | 46.8% | 49.8% |
| Currently Married | 51.9% | 45.8% | 48.0% |
| Married but Separated | 1.7% | 1.1% | 1.8% |
| Single Population | 46.4% | 53.2% | 50.2% |
| Never Married | 26.3% | 33.0% | 33.8% |
| Divorced | 12.2% | 17.1% | 10.8% |
| Widowed | 7.9% | 3.1% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 3.35 | 2.60 |
| Households | 842 | 534 | 124,010,992 |
| Family Households | 515 | 396 | 80,755,759 |
| Married couple, w/children | 24.5% | 33.6% | 30.5% |
| Married couple, no children | 55.3% | 37.4% | 42.9% |
| Non Family Households | 327 | 138 | 43,255,233 |
| Single householder, w/children | 9.7% | 23.7% | 15.8% |
| Single householder, no children | 10.5% | 5.3% | 10.8% |