| | Two Harbors, MN | Oroville, CA | United States |
| Population | 3,616 | 20,409 | 329,725,481 |
| Female Population | 50.7% | 50.5% | 50.5% |
| Male Population | 49.3% | 49.5% | 49.5% |
| Median Age | 41.7 | 34.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,739 | 18,698 | 309,327,143 |
| Population - 2000 | 3,613 | 13,004 | 285,036,114 |
| Population - 1990 | 3,651 | 11,960 | 251,960,433 |
| Pop. 2000 to Now | -2.9% | 55.6% | 15.6% |
| Pop. 1990 to Now | -3.9% | 69.2% | 30.8% |
| space4 | | | |
| Population Density | 1,104.8 | 1,475.3 | 93.4 |
| Land Area | 3.3 | 13.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Two Harbors, MN | Oroville, CA | United States |
| Age 0 to 4 | 6.2% | 8.5% | 5.9% |
| Age 5 to 9 | 7.5% | 5.6% | 6.1% |
| Age 10 to 14 | 4.9% | 7.0% | 6.6% |
| Age 15 to 17 | 5.0% | 4.2% | 3.9% |
| Age 18 to 20 | 2.1% | 2.9% | 4.0% |
| Age 21 to 24 | 4.6% | 5.0% | 5.2% |
| Age 25 to 34 | 12.1% | 17.0% | 13.8% |
| Age 35 to 44 | 13.2% | 12.6% | 12.9% |
| Age 45 to 54 | 9.2% | 8.8% | 12.6% |
| Age 55 to 59 | 9.0% | 7.2% | 6.7% |
| Age 60 to 64 | 5.0% | 5.7% | 6.3% |
| Age 65 to 74 | 12.4% | 8.1% | 9.6% |
| Age 75 to 84 | 5.5% | 5.6% | 4.5% |
| Age 85 and over | 3.5% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Two Harbors, MN | Oroville, CA | United States |
| White | 93.4% | 60.9% | 59.4% |
| Black | 0.7% | 4.9% | 12.2% |
| Asian | 0.0% | 12.9% | 5.6% |
| Native American | 0.6% | 1.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.3% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 2.6% | 4.5% | 3.2% |
| Hispanic | 2.7% | 14.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Two Harbors, MN | Oroville, CA | United States |
| Married Population | 51.4% | 38.2% | 49.8% |
| Currently Married | 49.2% | 35.3% | 48.0% |
| Married but Separated | 2.3% | 2.9% | 1.8% |
| Single Population | 48.6% | 61.8% | 50.2% |
| Never Married | 23.6% | 39.4% | 33.8% |
| Divorced | 11.8% | 14.6% | 10.8% |
| Widowed | 13.1% | 7.8% | 5.6% |
| space5 | | | |
| Household Size | 2.08 | 2.57 | 2.60 |
| Households | 1,673 | 7,352 | 124,010,992 |
| Family Households | 1,000 | 4,357 | 80,755,759 |
| Married couple, w/children | 33.0% | 27.2% | 30.5% |
| Married couple, no children | 36.2% | 28.6% | 42.9% |
| Non Family Households | 673 | 2,995 | 43,255,233 |
| Single householder, w/children | 19.8% | 29.9% | 15.8% |
| Single householder, no children | 11.0% | 14.3% | 10.8% |