| | New Castle, NY | Pittsford, NY | United States |
| Population | 18,170 | 30,364 | 329,725,481 |
| Female Population | 52.0% | 52.6% | 50.5% |
| Male Population | 48.0% | 47.4% | 49.5% |
| Median Age | 44.4 | 42.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 17,562 | 29,481 | 309,327,143 |
| Population - 2000 | 17,491 | 27,219 | 285,036,114 |
| Population - 1990 | 16,648 | 24,497 | 251,960,433 |
| Pop. 2000 to Now | 0.7% | 7.7% | 15.6% |
| Pop. 1990 to Now | 5.8% | 19.7% | 30.8% |
| space4 | | | |
| Population Density | 781.6 | 1,309.1 | 93.4 |
| Land Area | 23.2 | 23.2 | 3,531,905.4 |
| Water Area | 0.4 | 0.2 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | New Castle, NY | Pittsford, NY | United States |
| Age 0 to 4 | 4.7% | 5.5% | 5.9% |
| Age 5 to 9 | 7.0% | 6.0% | 6.1% |
| Age 10 to 14 | 7.9% | 6.9% | 6.6% |
| Age 15 to 17 | 6.2% | 3.8% | 3.9% |
| Age 18 to 20 | 4.1% | 8.6% | 4.0% |
| Age 21 to 24 | 4.4% | 3.9% | 5.2% |
| Age 25 to 34 | 6.6% | 7.1% | 13.8% |
| Age 35 to 44 | 9.9% | 10.2% | 12.9% |
| Age 45 to 54 | 17.2% | 12.5% | 12.6% |
| Age 55 to 59 | 10.3% | 7.3% | 6.7% |
| Age 60 to 64 | 6.7% | 8.0% | 6.3% |
| Age 65 to 74 | 9.3% | 10.9% | 9.6% |
| Age 75 to 84 | 3.0% | 6.1% | 4.5% |
| Age 85 and over | 2.8% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | New Castle, NY | Pittsford, NY | United States |
| White | 81.0% | 83.3% | 59.4% |
| Black | 4.3% | 2.5% | 12.2% |
| Asian | 7.9% | 8.3% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.2% | 0.4% |
| Two or More Races | 2.4% | 2.4% | 3.2% |
| Hispanic | 3.8% | 3.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | New Castle, NY | Pittsford, NY | United States |
| Married Population | 64.9% | 60.0% | 49.8% |
| Currently Married | 64.3% | 59.3% | 48.0% |
| Married but Separated | 0.6% | 0.7% | 1.8% |
| Single Population | 35.1% | 40.0% | 50.2% |
| Never Married | 27.4% | 28.1% | 33.8% |
| Divorced | 4.6% | 6.0% | 10.8% |
| Widowed | 3.0% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 3.02 | 2.62 | 2.60 |
| Households | 5,979 | 10,467 | 124,010,992 |
| Family Households | 5,250 | 7,866 | 80,755,759 |
| Married couple, w/children | 42.9% | 38.2% | 30.5% |
| Married couple, no children | 42.7% | 52.4% | 42.9% |
| Non Family Households | 729 | 2,601 | 43,255,233 |
| Single householder, w/children | 6.2% | 4.4% | 15.8% |
| Single householder, no children | 8.2% | 5.0% | 10.8% |