| | Brooklyn, OH | London, OH | United States |
| Population | 11,291 | 10,362 | 329,725,481 |
| Female Population | 50.5% | 50.0% | 50.5% |
| Male Population | 49.5% | 50.0% | 49.5% |
| Median Age | 43.8 | 41.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 11,225 | 9,891 | 309,327,143 |
| Population - 2000 | 11,586 | 8,771 | 285,036,114 |
| Population - 1990 | 11,706 | 7,807 | 251,960,433 |
| Pop. 2000 to Now | -8.2% | 17.6% | 15.6% |
| Pop. 1990 to Now | -9.1% | 32.1% | 30.8% |
| space4 | | | |
| Population Density | 2,658.0 | 1,235.2 | 93.4 |
| Land Area | 4.2 | 8.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Brooklyn, OH | London, OH | United States |
| Age 0 to 4 | 3.6% | 6.2% | 5.9% |
| Age 5 to 9 | 5.8% | 7.5% | 6.1% |
| Age 10 to 14 | 5.5% | 5.8% | 6.6% |
| Age 15 to 17 | 4.2% | 3.2% | 3.9% |
| Age 18 to 20 | 4.9% | 2.0% | 4.0% |
| Age 21 to 24 | 4.3% | 3.8% | 5.2% |
| Age 25 to 34 | 10.5% | 13.6% | 13.8% |
| Age 35 to 44 | 13.0% | 14.5% | 12.9% |
| Age 45 to 54 | 14.8% | 12.1% | 12.6% |
| Age 55 to 59 | 7.1% | 6.4% | 6.7% |
| Age 60 to 64 | 4.0% | 6.5% | 6.3% |
| Age 65 to 74 | 12.9% | 8.9% | 9.6% |
| Age 75 to 84 | 6.0% | 6.8% | 4.5% |
| Age 85 and over | 3.5% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Brooklyn, OH | London, OH | United States |
| White | 61.5% | 91.6% | 59.4% |
| Black | 11.4% | 2.2% | 12.2% |
| Asian | 6.7% | 1.7% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.7% | 0.1% | 0.4% |
| Two or More Races | 5.3% | 3.6% | 3.2% |
| Hispanic | 14.4% | 0.6% | 18.4% |
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| Marriage & Family | | | |
| | Brooklyn, OH | London, OH | United States |
| Married Population | 36.9% | 45.4% | 49.8% |
| Currently Married | 34.8% | 42.8% | 48.0% |
| Married but Separated | 2.1% | 2.7% | 1.8% |
| Single Population | 63.1% | 54.6% | 50.2% |
| Never Married | 40.0% | 24.7% | 33.8% |
| Divorced | 13.5% | 19.8% | 10.8% |
| Widowed | 9.6% | 10.1% | 5.6% |
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| Household Size | 2.34 | 2.28 | 2.60 |
| Households | 4,815 | 4,491 | 124,010,992 |
| Family Households | 2,800 | 2,441 | 80,755,759 |
| Married couple, w/children | 15.9% | 28.7% | 30.5% |
| Married couple, no children | 38.0% | 38.9% | 42.9% |
| Non Family Households | 2,015 | 2,050 | 43,255,233 |
| Single householder, w/children | 22.6% | 24.5% | 15.8% |
| Single householder, no children | 23.5% | 7.9% | 10.8% |