| | Barnstable Town, MA | Dublin, CA | United States |
| Population | 48,556 | 69,818 | 329,725,481 |
| Female Population | 51.4% | 50.9% | 50.5% |
| Male Population | 48.6% | 49.1% | 49.5% |
| Median Age | 47.4 | 36.5 | 38.4 |
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| Population - 2010 | 45,157 | 46,048 | 309,327,143 |
| Population - 2000 | 47,925 | 29,973 | 285,036,114 |
| Population - 1990 | 41,032 | 23,229 | 251,960,433 |
| Pop. 2000 to Now | -7.1% | 123.3% | 15.6% |
| Pop. 1990 to Now | 8.5% | 188.2% | 30.8% |
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| Population Density | 810.2 | 4,584.5 | 93.4 |
| Land Area | 59.9 | 15.2 | 3,531,905.4 |
| Water Area | 16.5 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Barnstable Town, MA | Dublin, CA | United States |
| Age 0 to 4 | 4.3% | 7.6% | 5.9% |
| Age 5 to 9 | 4.7% | 8.5% | 6.1% |
| Age 10 to 14 | 6.2% | 6.9% | 6.6% |
| Age 15 to 17 | 2.7% | 3.6% | 3.9% |
| Age 18 to 20 | 3.1% | 1.8% | 4.0% |
| Age 21 to 24 | 3.8% | 3.2% | 5.2% |
| Age 25 to 34 | 11.3% | 15.0% | 13.8% |
| Age 35 to 44 | 11.2% | 20.5% | 12.9% |
| Age 45 to 54 | 12.8% | 14.5% | 12.6% |
| Age 55 to 59 | 8.1% | 4.9% | 6.7% |
| Age 60 to 64 | 8.5% | 4.2% | 6.3% |
| Age 65 to 74 | 14.0% | 6.3% | 9.6% |
| Age 75 to 84 | 6.3% | 2.5% | 4.5% |
| Age 85 and over | 3.1% | 0.7% | 1.9% |
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| Race | | | |
| | Barnstable Town, MA | Dublin, CA | United States |
| White | 79.1% | 28.8% | 59.4% |
| Black | 5.5% | 3.6% | 12.2% |
| Asian | 0.9% | 52.3% | 5.6% |
| Native American | 0.2% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 2.2% | 0.4% | 0.4% |
| Two or More Races | 5.4% | 4.6% | 3.2% |
| Hispanic | 6.8% | 9.6% | 18.4% |
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| Marriage & Family | | | |
| | Barnstable Town, MA | Dublin, CA | United States |
| Married Population | 53.5% | 63.3% | 49.8% |
| Currently Married | 52.0% | 62.1% | 48.0% |
| Married but Separated | 1.5% | 1.1% | 1.8% |
| Single Population | 46.5% | 36.7% | 50.2% |
| Never Married | 28.9% | 25.2% | 33.8% |
| Divorced | 12.4% | 8.3% | 10.8% |
| Widowed | 5.2% | 3.2% | 5.6% |
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| Household Size | 2.43 | 2.98 | 2.60 |
| Households | 19,748 | 22,946 | 124,010,992 |
| Family Households | 12,764 | 18,069 | 80,755,759 |
| Married couple, w/children | 24.6% | 49.8% | 30.5% |
| Married couple, no children | 53.5% | 34.7% | 42.9% |
| Non Family Households | 6,984 | 4,877 | 43,255,233 |
| Single householder, w/children | 12.6% | 9.5% | 15.8% |
| Single householder, no children | 9.3% | 6.0% | 10.8% |