| | Coldspring, NY | Ardsley, NY | United States |
| Population | 645 | 4,984 | 329,725,481 |
| Female Population | 46.5% | 50.6% | 50.5% |
| Male Population | 53.5% | 49.4% | 49.5% |
| Median Age | 45.8 | 43.2 | 38.4 |
| space3 | | | |
| Population - 2010 | 665 | 4,419 | 309,327,143 |
| Population - 2000 | 751 | 4,269 | 285,036,114 |
| Population - 1990 | 732 | 4,272 | 251,960,433 |
| Pop. 2000 to Now | -13.7% | 5.5% | 15.6% |
| Pop. 1990 to Now | -11.5% | 5.4% | 30.8% |
| space4 | | | |
| Population Density | 12.5 | 3,767.2 | 93.4 |
| Land Area | 51.5 | 1.3 | 3,531,905.4 |
| Water Area | 0.6 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Coldspring, NY | Ardsley, NY | United States |
| Age 0 to 4 | 2.0% | 5.0% | 5.9% |
| Age 5 to 9 | 6.5% | 6.6% | 6.1% |
| Age 10 to 14 | 5.4% | 10.0% | 6.6% |
| Age 15 to 17 | 0.8% | 5.0% | 3.9% |
| Age 18 to 20 | 1.7% | 1.7% | 4.0% |
| Age 21 to 24 | 0.0% | 1.7% | 5.2% |
| Age 25 to 34 | 17.5% | 7.0% | 13.8% |
| Age 35 to 44 | 11.5% | 14.8% | 12.9% |
| Age 45 to 54 | 19.2% | 18.0% | 12.6% |
| Age 55 to 59 | 6.8% | 6.4% | 6.7% |
| Age 60 to 64 | 13.2% | 3.5% | 6.3% |
| Age 65 to 74 | 9.5% | 11.1% | 9.6% |
| Age 75 to 84 | 4.7% | 4.9% | 4.5% |
| Age 85 and over | 1.2% | 4.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Coldspring, NY | Ardsley, NY | United States |
| White | 96.6% | 67.3% | 59.4% |
| Black | 0.0% | 3.9% | 12.2% |
| Asian | 0.0% | 12.7% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 3.4% | 9.8% | 3.2% |
| Hispanic | 0.0% | 5.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Coldspring, NY | Ardsley, NY | United States |
| Married Population | 56.2% | 69.6% | 49.8% |
| Currently Married | 55.1% | 69.6% | 48.0% |
| Married but Separated | 1.1% | 0.0% | 1.8% |
| Single Population | 43.8% | 30.4% | 50.2% |
| Never Married | 19.5% | 21.9% | 33.8% |
| Divorced | 15.0% | 3.6% | 10.8% |
| Widowed | 9.4% | 4.9% | 5.6% |
| space5 | | | |
| Household Size | 2.37 | 3.06 | 2.60 |
| Households | 272 | 1,628 | 124,010,992 |
| Family Households | 183 | 1,449 | 80,755,759 |
| Married couple, w/children | 17.5% | 48.0% | 30.5% |
| Married couple, no children | 58.5% | 42.0% | 42.9% |
| Non Family Households | 89 | 179 | 43,255,233 |
| Single householder, w/children | 3.8% | 4.8% | 15.8% |
| Single householder, no children | 20.2% | 5.3% | 10.8% |