| Boston, MA | Bel Air North, MD | United States |
Population | 672,814 | 30,969 | 329,725,481 |
Female Population | 52.0% | 49.9% | 50.5% |
Male Population | 48.0% | 50.1% | 49.5% |
Median Age | 32.6 | 39.9 | 38.4 |
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Population - 2010 | 621,053 | 29,172 | 309,327,143 |
Population - 2000 | 589,141 | 25,798 | 285,036,114 |
Population - 1990 | 574,283 | 14,880 | 251,960,433 |
Pop. 2000 to Now | 17.4% | 24.6% | 15.6% |
Pop. 1990 to Now | 20.4% | 116.1% | 30.8% |
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Population Density | 13,919.5 | 1,940.3 | 93.4 |
Land Area | 48.3 | 16.0 | 3,531,905.4 |
Water Area | 41.3 | 0.1 | 264,836.8 |
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Est. Total Population By Age | | | |
| Boston, MA | Bel Air North, MD | United States |
Age 0 to 4 | 4.8% | 6.0% | 5.9% |
Age 5 to 9 | 4.1% | 7.3% | 6.1% |
Age 10 to 14 | 4.4% | 7.8% | 6.6% |
Age 15 to 17 | 2.5% | 4.5% | 3.9% |
Age 18 to 20 | 7.0% | 3.1% | 4.0% |
Age 21 to 24 | 7.9% | 4.1% | 5.2% |
Age 25 to 34 | 23.9% | 10.3% | 13.8% |
Age 35 to 44 | 12.8% | 13.1% | 12.9% |
Age 45 to 54 | 10.6% | 16.7% | 12.6% |
Age 55 to 59 | 5.4% | 6.6% | 6.7% |
Age 60 to 64 | 4.9% | 5.9% | 6.3% |
Age 65 to 74 | 7.0% | 8.3% | 9.6% |
Age 75 to 84 | 3.2% | 4.4% | 4.5% |
Age 85 and over | 1.6% | 1.8% | 1.9% |
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Race | | | |
| Boston, MA | Bel Air North, MD | United States |
White | 44.0% | 89.4% | 59.4% |
Black | 21.7% | 2.9% | 12.2% |
Asian | 9.6% | 1.6% | 5.6% |
Native American | 0.2% | 0.0% | 0.6% |
Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
Other | 0.8% | 0.0% | 0.4% |
Two or More Races | 3.9% | 3.7% | 3.2% |
Hispanic | 19.8% | 2.4% | 18.4% |
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Marriage & Family | | | |
| Boston, MA | Bel Air North, MD | United States |
Married Population | 33.4% | 65.6% | 49.8% |
Currently Married | 30.9% | 64.5% | 48.0% |
Married but Separated | 2.5% | 1.2% | 1.8% |
Single Population | 66.6% | 34.4% | 50.2% |
Never Married | 55.7% | 23.8% | 33.8% |
Divorced | 7.3% | 5.2% | 10.8% |
Widowed | 3.6% | 5.4% | 5.6% |
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Household Size | 2.30 | 2.81 | 2.60 |
Households | 271,950 | 10,815 | 124,010,992 |
Family Households | 128,147 | 8,662 | 80,755,759 |
Married couple, w/children | 22.5% | 43.9% | 30.5% |
Married couple, no children | 37.9% | 45.8% | 42.9% |
Non Family Households | 143,803 | 2,153 | 43,255,233 |
Single householder, w/children | 21.5% | 5.5% | 15.8% |
Single householder, no children | 18.1% | 4.8% | 10.8% |