| | Nantucket, MA | Westcliffe, CO | United States |
| Population | 13,795 | 403 | 329,725,481 |
| Female Population | 44.9% | 54.1% | 50.5% |
| Male Population | 55.1% | 45.9% | 49.5% |
| Median Age | 41.9 | 54.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,165 | 575 | 309,327,143 |
| Population - 2000 | 9,520 | 417 | 285,036,114 |
| Population - 1990 | 6,012 | 312 | 251,960,433 |
| Pop. 2000 to Now | 19.5% | 66.0% | 15.6% |
| Pop. 1990 to Now | 89.2% | 121.8% | 30.8% |
| space4 | | | |
| Population Density | 306.8 | 326.3 | 93.4 |
| Land Area | 45.0 | 1.2 | 3,531,905.4 |
| Water Area | 60.3 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Nantucket, MA | Westcliffe, CO | United States |
| Age 0 to 4 | 4.6% | 1.0% | 5.9% |
| Age 5 to 9 | 4.2% | 0.7% | 6.1% |
| Age 10 to 14 | 5.7% | 6.0% | 6.6% |
| Age 15 to 17 | 4.7% | 4.5% | 3.9% |
| Age 18 to 20 | 2.2% | 2.0% | 4.0% |
| Age 21 to 24 | 4.5% | 4.5% | 5.2% |
| Age 25 to 34 | 14.4% | 10.4% | 13.8% |
| Age 35 to 44 | 12.8% | 11.4% | 12.9% |
| Age 45 to 54 | 16.6% | 12.9% | 12.6% |
| Age 55 to 59 | 7.2% | 5.7% | 6.7% |
| Age 60 to 64 | 7.3% | 9.9% | 6.3% |
| Age 65 to 74 | 9.9% | 18.4% | 9.6% |
| Age 75 to 84 | 3.8% | 10.7% | 4.5% |
| Age 85 and over | 1.9% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Nantucket, MA | Westcliffe, CO | United States |
| White | 71.7% | 93.5% | 59.4% |
| Black | 8.2% | 0.0% | 12.2% |
| Asian | 1.7% | 0.0% | 5.6% |
| Native American | 0.0% | 1.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 1.7% | 0.4% |
| Two or More Races | 3.3% | 0.2% | 3.2% |
| Hispanic | 14.7% | 3.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Nantucket, MA | Westcliffe, CO | United States |
| Married Population | 49.9% | 44.9% | 49.8% |
| Currently Married | 49.2% | 43.3% | 48.0% |
| Married but Separated | 0.7% | 1.6% | 1.8% |
| Single Population | 50.1% | 55.1% | 50.2% |
| Never Married | 36.4% | 32.0% | 33.8% |
| Divorced | 9.9% | 14.5% | 10.8% |
| Widowed | 3.7% | 8.6% | 5.6% |
| space5 | | | |
| Household Size | 3.36 | 1.69 | 2.60 |
| Households | 4,031 | 234 | 124,010,992 |
| Family Households | 2,822 | 88 | 80,755,759 |
| Married couple, w/children | 33.5% | 21.6% | 30.5% |
| Married couple, no children | 50.9% | 67.0% | 42.9% |
| Non Family Households | 1,209 | 146 | 43,255,233 |
| Single householder, w/children | 7.0% | 9.1% | 15.8% |
| Single householder, no children | 8.6% | 2.3% | 10.8% |