| | Chilmark, MA | Kailua (Honolulu County), HI | United States |
| Population | 1,460 | 40,402 | 329,725,481 |
| Female Population | 47.7% | 50.2% | 50.5% |
| Male Population | 52.3% | 49.8% | 49.5% |
| Median Age | 53.5 | 41.9 | 38.4 |
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| Population - 2010 | 873 | 38,541 | 309,327,143 |
| Population - 2000 | 843 | 36,513 | 285,036,114 |
| Population - 1990 | 650 | 36,818 | 251,960,433 |
| Pop. 2000 to Now | 10.3% | 1.4% | 15.6% |
| Pop. 1990 to Now | 43.1% | 0.5% | 30.8% |
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| Population Density | 76.7 | 5,202.4 | 93.4 |
| Land Area | 19.0 | 7.8 | 3,531,905.4 |
| Water Area | 81.4 | 2.8 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Chilmark, MA | Kailua (Honolulu County), HI | United States |
| Age 0 to 4 | 0.7% | 5.6% | 5.9% |
| Age 5 to 9 | 1.4% | 6.2% | 6.1% |
| Age 10 to 14 | 6.0% | 6.7% | 6.6% |
| Age 15 to 17 | 1.8% | 3.2% | 3.9% |
| Age 18 to 20 | 1.5% | 2.9% | 4.0% |
| Age 21 to 24 | 4.9% | 3.9% | 5.2% |
| Age 25 to 34 | 10.5% | 11.7% | 13.8% |
| Age 35 to 44 | 6.7% | 14.4% | 12.9% |
| Age 45 to 54 | 23.2% | 12.2% | 12.6% |
| Age 55 to 59 | 4.7% | 7.0% | 6.7% |
| Age 60 to 64 | 5.3% | 6.6% | 6.3% |
| Age 65 to 74 | 20.1% | 11.5% | 9.6% |
| Age 75 to 84 | 11.1% | 4.9% | 4.5% |
| Age 85 and over | 2.1% | 3.2% | 1.9% |
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| Race | | | |
| | Chilmark, MA | Kailua (Honolulu County), HI | United States |
| White | 89.2% | 41.4% | 59.4% |
| Black | 1.8% | 0.6% | 12.2% |
| Asian | 6.6% | 19.9% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 4.1% | 0.2% |
| Other | 0.0% | 0.9% | 0.4% |
| Two or More Races | 1.8% | 24.3% | 3.2% |
| Hispanic | 0.5% | 8.7% | 18.4% |
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| Marriage & Family | | | |
| | Chilmark, MA | Kailua (Honolulu County), HI | United States |
| Married Population | 53.7% | 57.1% | 49.8% |
| Currently Married | 52.8% | 56.4% | 48.0% |
| Married but Separated | 0.8% | 0.7% | 1.8% |
| Single Population | 46.3% | 42.9% | 50.2% |
| Never Married | 30.5% | 27.8% | 33.8% |
| Divorced | 11.9% | 8.9% | 10.8% |
| Widowed | 3.9% | 6.2% | 5.6% |
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| Household Size | 2.79 | 3.08 | 2.60 |
| Households | 519 | 13,039 | 124,010,992 |
| Family Households | 391 | 9,735 | 80,755,759 |
| Married couple, w/children | 10.2% | 32.9% | 30.5% |
| Married couple, no children | 70.3% | 46.4% | 42.9% |
| Non Family Households | 128 | 3,304 | 43,255,233 |
| Single householder, w/children | 12.3% | 8.2% | 15.8% |
| Single householder, no children | 7.2% | 12.5% | 10.8% |