| | Ilion, NY | Cortland, NY | United States |
| Population | 7,826 | 17,577 | 329,725,481 |
| Female Population | 52.8% | 53.6% | 50.5% |
| Male Population | 47.2% | 46.4% | 49.5% |
| Median Age | 42 | 27.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 8,183 | 19,179 | 309,327,143 |
| Population - 2000 | 8,610 | 18,740 | 285,036,114 |
| Population - 1990 | 8,888 | 19,801 | 251,960,433 |
| Pop. 2000 to Now | -11.5% | -1.5% | 15.6% |
| Pop. 1990 to Now | -14.3% | -6.8% | 30.8% |
| space4 | | | |
| Population Density | 3,139.2 | 4,513.9 | 93.4 |
| Land Area | 2.5 | 3.9 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Ilion, NY | Cortland, NY | United States |
| Age 0 to 4 | 3.0% | 4.4% | 5.9% |
| Age 5 to 9 | 10.4% | 4.8% | 6.1% |
| Age 10 to 14 | 8.3% | 3.9% | 6.6% |
| Age 15 to 17 | 1.6% | 2.3% | 3.9% |
| Age 18 to 20 | 3.2% | 16.5% | 4.0% |
| Age 21 to 24 | 2.6% | 14.5% | 5.2% |
| Age 25 to 34 | 16.7% | 13.2% | 13.8% |
| Age 35 to 44 | 6.8% | 7.8% | 12.9% |
| Age 45 to 54 | 15.8% | 9.4% | 12.6% |
| Age 55 to 59 | 6.1% | 5.3% | 6.7% |
| Age 60 to 64 | 7.1% | 5.0% | 6.3% |
| Age 65 to 74 | 10.3% | 7.6% | 9.6% |
| Age 75 to 84 | 4.9% | 3.3% | 4.5% |
| Age 85 and over | 3.2% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Ilion, NY | Cortland, NY | United States |
| White | 93.6% | 88.3% | 59.4% |
| Black | 2.0% | 3.4% | 12.2% |
| Asian | 0.6% | 1.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 1.9% | 2.5% | 3.2% |
| Hispanic | 2.0% | 4.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Ilion, NY | Cortland, NY | United States |
| Married Population | 49.8% | 29.0% | 49.8% |
| Currently Married | 47.3% | 26.6% | 48.0% |
| Married but Separated | 2.5% | 2.4% | 1.8% |
| Single Population | 50.2% | 71.0% | 50.2% |
| Never Married | 30.1% | 56.2% | 33.8% |
| Divorced | 13.3% | 10.5% | 10.8% |
| Widowed | 6.8% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.42 | 2.20 | 2.60 |
| Households | 3,177 | 6,588 | 124,010,992 |
| Family Households | 1,913 | 3,167 | 80,755,759 |
| Married couple, w/children | 24.7% | 24.7% | 30.5% |
| Married couple, no children | 48.2% | 36.9% | 42.9% |
| Non Family Households | 1,264 | 3,421 | 43,255,233 |
| Single householder, w/children | 13.7% | 28.1% | 15.8% |
| Single householder, no children | 13.3% | 10.3% | 10.8% |