| | Gloucester, MA | Hailey, ID | United States |
| Population | 29,814 | 9,001 | 329,725,481 |
| Female Population | 50.7% | 53.5% | 50.5% |
| Male Population | 49.3% | 46.5% | 49.5% |
| Median Age | 50.2 | 41 | 38.4 |
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| Population - 2010 | 28,872 | 7,942 | 309,327,143 |
| Population - 2000 | 30,273 | 6,200 | 285,036,114 |
| Population - 1990 | 28,716 | 3,687 | 251,960,433 |
| Pop. 2000 to Now | 0.9% | 43.3% | 15.6% |
| Pop. 1990 to Now | 6.4% | 141.0% | 30.8% |
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| Population Density | 1,138.0 | 2,289.2 | 93.4 |
| Land Area | 26.2 | 3.9 | 3,531,905.4 |
| Water Area | 15.3 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Gloucester, MA | Hailey, ID | United States |
| Age 0 to 4 | 4.9% | 5.4% | 5.9% |
| Age 5 to 9 | 4.0% | 10.9% | 6.1% |
| Age 10 to 14 | 4.5% | 8.8% | 6.6% |
| Age 15 to 17 | 2.7% | 3.6% | 3.9% |
| Age 18 to 20 | 2.6% | 3.0% | 4.0% |
| Age 21 to 24 | 4.4% | 3.5% | 5.2% |
| Age 25 to 34 | 11.3% | 4.8% | 13.8% |
| Age 35 to 44 | 10.1% | 16.4% | 12.9% |
| Age 45 to 54 | 13.0% | 14.3% | 12.6% |
| Age 55 to 59 | 8.7% | 10.9% | 6.7% |
| Age 60 to 64 | 9.4% | 7.1% | 6.3% |
| Age 65 to 74 | 15.7% | 4.7% | 9.6% |
| Age 75 to 84 | 6.4% | 5.5% | 4.5% |
| Age 85 and over | 2.4% | 1.0% | 1.9% |
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| Race | | | |
| | Gloucester, MA | Hailey, ID | United States |
| White | 90.1% | 64.6% | 59.4% |
| Black | 1.9% | 0.0% | 12.2% |
| Asian | 1.6% | 0.2% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 2.4% | 3.7% | 3.2% |
| Hispanic | 3.9% | 31.5% | 18.4% |
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| Marriage & Family | | | |
| | Gloucester, MA | Hailey, ID | United States |
| Married Population | 52.9% | 64.9% | 49.8% |
| Currently Married | 51.4% | 63.9% | 48.0% |
| Married but Separated | 1.5% | 1.0% | 1.8% |
| Single Population | 47.1% | 35.1% | 50.2% |
| Never Married | 28.7% | 20.1% | 33.8% |
| Divorced | 12.3% | 12.3% | 10.8% |
| Widowed | 6.1% | 2.7% | 5.6% |
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| Household Size | 2.24 | 2.73 | 2.60 |
| Households | 13,168 | 3,277 | 124,010,992 |
| Family Households | 8,094 | 2,332 | 80,755,759 |
| Married couple, w/children | 25.0% | 32.7% | 30.5% |
| Married couple, no children | 52.6% | 46.1% | 42.9% |
| Non Family Households | 5,074 | 945 | 43,255,233 |
| Single householder, w/children | 9.9% | 19.9% | 15.8% |
| Single householder, no children | 12.5% | 1.2% | 10.8% |