| | Mill City, OR | Yreka, CA | United States |
| Population | 1,904 | 7,807 | 329,725,481 |
| Female Population | 50.8% | 51.2% | 50.5% |
| Male Population | 49.2% | 48.8% | 49.5% |
| Median Age | 45.9 | 35.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,865 | 7,791 | 309,327,143 |
| Population - 2000 | 1,537 | 7,290 | 285,036,114 |
| Population - 1990 | 1,555 | 6,948 | 251,960,433 |
| Pop. 2000 to Now | 29.0% | 2.9% | 15.6% |
| Pop. 1990 to Now | 27.5% | 8.0% | 30.8% |
| space4 | | | |
| Population Density | 2,269.4 | 781.9 | 93.4 |
| Land Area | 0.8 | 10.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mill City, OR | Yreka, CA | United States |
| Age 0 to 4 | 5.9% | 5.1% | 5.9% |
| Age 5 to 9 | 5.7% | 8.4% | 6.1% |
| Age 10 to 14 | 2.7% | 9.4% | 6.6% |
| Age 15 to 17 | 7.9% | 4.0% | 3.9% |
| Age 18 to 20 | 2.6% | 4.3% | 4.0% |
| Age 21 to 24 | 3.0% | 3.1% | 5.2% |
| Age 25 to 34 | 12.0% | 14.8% | 13.8% |
| Age 35 to 44 | 9.2% | 11.5% | 12.9% |
| Age 45 to 54 | 13.4% | 7.1% | 12.6% |
| Age 55 to 59 | 8.7% | 4.2% | 6.7% |
| Age 60 to 64 | 9.0% | 5.5% | 6.3% |
| Age 65 to 74 | 8.4% | 15.2% | 9.6% |
| Age 75 to 84 | 10.0% | 5.0% | 4.5% |
| Age 85 and over | 1.4% | 2.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mill City, OR | Yreka, CA | United States |
| White | 81.3% | 68.4% | 59.4% |
| Black | 1.4% | 2.7% | 12.2% |
| Asian | 0.2% | 0.1% | 5.6% |
| Native American | 0.0% | 2.9% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 1.8% | 0.2% |
| Other | 2.8% | 0.1% | 0.4% |
| Two or More Races | 8.8% | 6.4% | 3.2% |
| Hispanic | 5.7% | 17.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mill City, OR | Yreka, CA | United States |
| Married Population | 49.8% | 41.7% | 49.8% |
| Currently Married | 46.0% | 40.0% | 48.0% |
| Married but Separated | 3.7% | 1.7% | 1.8% |
| Single Population | 50.2% | 58.3% | 50.2% |
| Never Married | 28.9% | 31.8% | 33.8% |
| Divorced | 13.4% | 16.2% | 10.8% |
| Widowed | 8.0% | 10.4% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 2.41 | 2.60 |
| Households | 731 | 3,210 | 124,010,992 |
| Family Households | 501 | 1,703 | 80,755,759 |
| Married couple, w/children | 24.2% | 27.7% | 30.5% |
| Married couple, no children | 46.9% | 37.9% | 42.9% |
| Non Family Households | 230 | 1,507 | 43,255,233 |
| Single householder, w/children | 19.2% | 28.2% | 15.8% |
| Single householder, no children | 9.8% | 6.2% | 10.8% |