| | Oregon, IL | Freeport, IL | United States |
| Population | 3,927 | 24,087 | 329,725,481 |
| Female Population | 47.6% | 53.1% | 50.5% |
| Male Population | 52.4% | 46.9% | 49.5% |
| Median Age | 45.2 | 43.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,713 | 25,617 | 309,327,143 |
| Population - 2000 | 4,060 | 26,443 | 285,036,114 |
| Population - 1990 | 3,891 | 25,840 | 251,960,433 |
| Pop. 2000 to Now | -15.1% | -11.3% | 15.6% |
| Pop. 1990 to Now | -11.4% | -9.3% | 30.8% |
| space4 | | | |
| Population Density | 2,001.5 | 2,071.3 | 93.4 |
| Land Area | 2.0 | 11.6 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Oregon, IL | Freeport, IL | United States |
| Age 0 to 4 | 5.7% | 7.1% | 5.9% |
| Age 5 to 9 | 5.8% | 6.0% | 6.1% |
| Age 10 to 14 | 7.6% | 6.1% | 6.6% |
| Age 15 to 17 | 4.6% | 3.0% | 3.9% |
| Age 18 to 20 | 1.4% | 3.1% | 4.0% |
| Age 21 to 24 | 4.4% | 5.7% | 5.2% |
| Age 25 to 34 | 6.6% | 11.1% | 13.8% |
| Age 35 to 44 | 13.8% | 9.8% | 12.9% |
| Age 45 to 54 | 16.2% | 12.0% | 12.6% |
| Age 55 to 59 | 5.9% | 6.0% | 6.7% |
| Age 60 to 64 | 7.0% | 7.0% | 6.3% |
| Age 65 to 74 | 11.6% | 12.6% | 9.6% |
| Age 75 to 84 | 5.4% | 6.3% | 4.5% |
| Age 85 and over | 4.1% | 4.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Oregon, IL | Freeport, IL | United States |
| White | 90.5% | 69.6% | 59.4% |
| Black | 0.8% | 16.3% | 12.2% |
| Asian | 0.4% | 1.2% | 5.6% |
| Native American | 0.2% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.0% | 6.4% | 3.2% |
| Hispanic | 7.0% | 6.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Oregon, IL | Freeport, IL | United States |
| Married Population | 47.9% | 44.0% | 49.8% |
| Currently Married | 47.7% | 42.4% | 48.0% |
| Married but Separated | 0.3% | 1.6% | 1.8% |
| Single Population | 52.1% | 56.0% | 50.2% |
| Never Married | 28.7% | 32.4% | 33.8% |
| Divorced | 18.0% | 15.9% | 10.8% |
| Widowed | 5.4% | 7.7% | 5.6% |
| space5 | | | |
| Household Size | 2.31 | 2.16 | 2.60 |
| Households | 1,637 | 10,828 | 124,010,992 |
| Family Households | 1,004 | 6,252 | 80,755,759 |
| Married couple, w/children | 26.9% | 19.9% | 30.5% |
| Married couple, no children | 46.1% | 43.7% | 42.9% |
| Non Family Households | 633 | 4,576 | 43,255,233 |
| Single householder, w/children | 18.0% | 24.7% | 15.8% |
| Single householder, no children | 9.0% | 11.7% | 10.8% |