| | London, OH | Essex, MD | United States |
| Population | 10,362 | 40,710 | 329,725,481 |
| Female Population | 50.0% | 53.3% | 50.5% |
| Male Population | 50.0% | 46.7% | 49.5% |
| Median Age | 41.1 | 38.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 9,891 | 38,790 | 309,327,143 |
| Population - 2000 | 8,771 | 39,078 | 285,036,114 |
| Population - 1990 | 7,807 | 40,872 | 251,960,433 |
| Pop. 2000 to Now | 17.6% | 0.9% | 15.6% |
| Pop. 1990 to Now | 32.1% | -3.6% | 30.8% |
| space4 | | | |
| Population Density | 1,235.2 | 4,397.3 | 93.4 |
| Land Area | 8.4 | 9.3 | 3,531,905.4 |
| Water Area | 0.0 | 2.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | London, OH | Essex, MD | United States |
| Age 0 to 4 | 6.2% | 6.1% | 5.9% |
| Age 5 to 9 | 7.5% | 6.7% | 6.1% |
| Age 10 to 14 | 5.8% | 6.4% | 6.6% |
| Age 15 to 17 | 3.2% | 3.7% | 3.9% |
| Age 18 to 20 | 2.0% | 2.7% | 4.0% |
| Age 21 to 24 | 3.8% | 3.9% | 5.2% |
| Age 25 to 34 | 13.6% | 15.8% | 13.8% |
| Age 35 to 44 | 14.5% | 10.9% | 12.9% |
| Age 45 to 54 | 12.1% | 13.8% | 12.6% |
| Age 55 to 59 | 6.4% | 7.2% | 6.7% |
| Age 60 to 64 | 6.5% | 7.1% | 6.3% |
| Age 65 to 74 | 8.9% | 9.4% | 9.6% |
| Age 75 to 84 | 6.8% | 4.5% | 4.5% |
| Age 85 and over | 2.6% | 1.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | London, OH | Essex, MD | United States |
| White | 91.6% | 57.8% | 59.4% |
| Black | 2.2% | 29.4% | 12.2% |
| Asian | 1.7% | 1.7% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.3% | 0.4% |
| Two or More Races | 3.6% | 4.4% | 3.2% |
| Hispanic | 0.6% | 6.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | London, OH | Essex, MD | United States |
| Married Population | 45.4% | 42.2% | 49.8% |
| Currently Married | 42.8% | 39.4% | 48.0% |
| Married but Separated | 2.7% | 2.8% | 1.8% |
| Single Population | 54.6% | 57.8% | 50.2% |
| Never Married | 24.7% | 35.9% | 33.8% |
| Divorced | 19.8% | 14.2% | 10.8% |
| Widowed | 10.1% | 7.8% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.58 | 2.60 |
| Households | 4,491 | 15,702 | 124,010,992 |
| Family Households | 2,441 | 9,472 | 80,755,759 |
| Married couple, w/children | 28.7% | 21.8% | 30.5% |
| Married couple, no children | 38.9% | 37.5% | 42.9% |
| Non Family Households | 2,050 | 6,230 | 43,255,233 |
| Single householder, w/children | 24.5% | 25.9% | 15.8% |
| Single householder, no children | 7.9% | 14.8% | 10.8% |