| | Dixon, IL | Oglesby, IL | United States |
| Population | 15,855 | 3,570 | 329,725,481 |
| Female Population | 43.1% | 47.8% | 50.5% |
| Male Population | 56.9% | 52.2% | 49.5% |
| Median Age | 41.1 | 40.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 15,727 | 3,802 | 309,327,143 |
| Population - 2000 | 15,941 | 3,647 | 285,036,114 |
| Population - 1990 | 15,144 | 3,619 | 251,960,433 |
| Pop. 2000 to Now | -6.4% | -3.3% | 15.6% |
| Pop. 1990 to Now | -1.4% | -2.6% | 30.8% |
| space4 | | | |
| Population Density | 2,108.1 | 879.5 | 93.4 |
| Land Area | 7.5 | 4.1 | 3,531,905.4 |
| Water Area | 0.4 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Dixon, IL | Oglesby, IL | United States |
| Age 0 to 4 | 5.0% | 4.0% | 5.9% |
| Age 5 to 9 | 5.3% | 9.7% | 6.1% |
| Age 10 to 14 | 5.1% | 6.5% | 6.6% |
| Age 15 to 17 | 4.3% | 4.4% | 3.9% |
| Age 18 to 20 | 3.0% | 3.4% | 4.0% |
| Age 21 to 24 | 3.3% | 2.4% | 5.2% |
| Age 25 to 34 | 16.2% | 13.4% | 13.8% |
| Age 35 to 44 | 13.9% | 10.2% | 12.9% |
| Age 45 to 54 | 11.5% | 12.4% | 12.6% |
| Age 55 to 59 | 8.8% | 9.7% | 6.7% |
| Age 60 to 64 | 6.3% | 4.9% | 6.3% |
| Age 65 to 74 | 9.5% | 10.2% | 9.6% |
| Age 75 to 84 | 4.4% | 5.1% | 4.5% |
| Age 85 and over | 3.5% | 3.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Dixon, IL | Oglesby, IL | United States |
| White | 78.5% | 85.0% | 59.4% |
| Black | 10.6% | 0.0% | 12.2% |
| Asian | 0.9% | 0.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.9% | 0.3% | 3.2% |
| Hispanic | 8.1% | 14.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Dixon, IL | Oglesby, IL | United States |
| Married Population | 37.5% | 53.1% | 49.8% |
| Currently Married | 36.3% | 50.5% | 48.0% |
| Married but Separated | 1.2% | 2.5% | 1.8% |
| Single Population | 62.5% | 47.0% | 50.2% |
| Never Married | 38.9% | 30.7% | 33.8% |
| Divorced | 15.1% | 10.5% | 10.8% |
| Widowed | 8.4% | 5.7% | 5.6% |
| space5 | | | |
| Household Size | 2.20 | 2.34 | 2.60 |
| Households | 5,884 | 1,525 | 124,010,992 |
| Family Households | 3,015 | 964 | 80,755,759 |
| Married couple, w/children | 31.8% | 25.7% | 30.5% |
| Married couple, no children | 38.6% | 42.4% | 42.9% |
| Non Family Households | 2,869 | 561 | 43,255,233 |
| Single householder, w/children | 24.1% | 23.1% | 15.8% |
| Single householder, no children | 5.6% | 8.7% | 10.8% |