| | Carle Place, NY | Westbury, NY | United States |
| Population | 5,177 | 15,772 | 329,725,481 |
| Female Population | 49.3% | 51.5% | 50.5% |
| Male Population | 50.7% | 48.5% | 49.5% |
| Median Age | 40.9 | 42.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 5,588 | 15,067 | 309,327,143 |
| Population - 2000 | 5,247 | 14,263 | 285,036,114 |
| Population - 1990 | 5,107 | 13,060 | 251,960,433 |
| Pop. 2000 to Now | -6.5% | 7.2% | 15.6% |
| Pop. 1990 to Now | -4.0% | 17.1% | 30.8% |
| space4 | | | |
| Population Density | 5,536.9 | 6,728.7 | 93.4 |
| Land Area | 0.9 | 2.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Carle Place, NY | Westbury, NY | United States |
| Age 0 to 4 | 3.9% | 6.1% | 5.9% |
| Age 5 to 9 | 3.2% | 4.1% | 6.1% |
| Age 10 to 14 | 8.1% | 5.6% | 6.6% |
| Age 15 to 17 | 4.7% | 3.3% | 3.9% |
| Age 18 to 20 | 3.2% | 2.6% | 4.0% |
| Age 21 to 24 | 4.9% | 4.5% | 5.2% |
| Age 25 to 34 | 15.4% | 13.2% | 13.8% |
| Age 35 to 44 | 12.5% | 13.5% | 12.9% |
| Age 45 to 54 | 12.6% | 13.7% | 12.6% |
| Age 55 to 59 | 8.5% | 7.7% | 6.7% |
| Age 60 to 64 | 8.3% | 7.7% | 6.3% |
| Age 65 to 74 | 9.6% | 9.9% | 9.6% |
| Age 75 to 84 | 3.7% | 5.6% | 4.5% |
| Age 85 and over | 1.5% | 2.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Carle Place, NY | Westbury, NY | United States |
| White | 73.2% | 40.0% | 59.4% |
| Black | 1.6% | 18.9% | 12.2% |
| Asian | 11.9% | 8.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 2.4% | 0.6% | 0.4% |
| Two or More Races | 1.4% | 2.5% | 3.2% |
| Hispanic | 9.5% | 29.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Carle Place, NY | Westbury, NY | United States |
| Married Population | 55.8% | 53.3% | 49.8% |
| Currently Married | 55.6% | 52.6% | 48.0% |
| Married but Separated | 0.2% | 0.7% | 1.8% |
| Single Population | 44.2% | 46.7% | 50.2% |
| Never Married | 31.2% | 35.2% | 33.8% |
| Divorced | 6.1% | 6.0% | 10.8% |
| Widowed | 6.8% | 5.5% | 5.6% |
| space5 | | | |
| Household Size | 2.82 | 2.98 | 2.60 |
| Households | 1,834 | 5,259 | 124,010,992 |
| Family Households | 1,501 | 3,825 | 80,755,759 |
| Married couple, w/children | 29.9% | 30.6% | 30.5% |
| Married couple, no children | 48.3% | 46.9% | 42.9% |
| Non Family Households | 333 | 1,434 | 43,255,233 |
| Single householder, w/children | 13.2% | 10.6% | 15.8% |
| Single householder, no children | 8.6% | 11.9% | 10.8% |