| | Castleton, VT | Cairo, NY | United States |
| Population | 4,605 | 6,652 | 329,725,481 |
| Female Population | 54.7% | 54.5% | 50.5% |
| Male Population | 45.3% | 45.5% | 49.5% |
| Median Age | 35.9 | 45.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,712 | 6,648 | 309,327,143 |
| Population - 2000 | 4,367 | 6,355 | 285,036,114 |
| Population - 1990 | 4,278 | 5,418 | 251,960,433 |
| Pop. 2000 to Now | 2.8% | 1.0% | 15.6% |
| Pop. 1990 to Now | 5.0% | 18.5% | 30.8% |
| space4 | | | |
| Population Density | 118.4 | 111.2 | 93.4 |
| Land Area | 38.9 | 59.8 | 3,531,905.4 |
| Water Area | 3.5 | 0.3 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Castleton, VT | Cairo, NY | United States |
| Age 0 to 4 | 2.1% | 3.5% | 5.9% |
| Age 5 to 9 | 4.2% | 3.7% | 6.1% |
| Age 10 to 14 | 7.1% | 9.2% | 6.6% |
| Age 15 to 17 | 3.7% | 1.4% | 3.9% |
| Age 18 to 20 | 15.9% | 3.0% | 4.0% |
| Age 21 to 24 | 8.4% | 3.1% | 5.2% |
| Age 25 to 34 | 5.9% | 12.3% | 13.8% |
| Age 35 to 44 | 8.0% | 12.9% | 12.9% |
| Age 45 to 54 | 10.4% | 16.3% | 12.6% |
| Age 55 to 59 | 9.4% | 5.3% | 6.7% |
| Age 60 to 64 | 6.2% | 8.2% | 6.3% |
| Age 65 to 74 | 10.0% | 12.0% | 9.6% |
| Age 75 to 84 | 5.5% | 6.5% | 4.5% |
| Age 85 and over | 3.2% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Castleton, VT | Cairo, NY | United States |
| White | 95.0% | 87.6% | 59.4% |
| Black | 1.5% | 0.3% | 12.2% |
| Asian | 0.4% | 0.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.6% | 3.8% | 3.2% |
| Hispanic | 1.4% | 7.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Castleton, VT | Cairo, NY | United States |
| Married Population | 32.8% | 48.9% | 49.8% |
| Currently Married | 31.3% | 47.6% | 48.0% |
| Married but Separated | 1.6% | 1.3% | 1.8% |
| Single Population | 67.2% | 51.2% | 50.2% |
| Never Married | 47.3% | 26.2% | 33.8% |
| Divorced | 11.2% | 15.7% | 10.8% |
| Widowed | 8.7% | 9.3% | 5.6% |
| space5 | | | |
| Household Size | 2.20 | 2.87 | 2.60 |
| Households | 1,685 | 2,293 | 124,010,992 |
| Family Households | 762 | 1,460 | 80,755,759 |
| Married couple, w/children | 24.0% | 24.7% | 30.5% |
| Married couple, no children | 46.6% | 45.1% | 42.9% |
| Non Family Households | 923 | 833 | 43,255,233 |
| Single householder, w/children | 13.9% | 17.7% | 15.8% |
| Single householder, no children | 15.5% | 12.5% | 10.8% |