| | Bel Air town (Harford County), MD | Apopka, FL | United States |
| Population | 10,663 | 54,110 | 329,725,481 |
| Female Population | 49.9% | 50.7% | 50.5% |
| Male Population | 50.1% | 49.3% | 49.5% |
| Median Age | 42.7 | 38.8 | 38.4 |
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| Population - 2010 | 10,149 | 42,449 | 309,327,143 |
| Population - 2000 | 10,080 | 26,642 | 285,036,114 |
| Population - 1990 | 8,860 | 13,512 | 251,960,433 |
| Pop. 2000 to Now | 1.9% | 102.2% | 15.6% |
| Pop. 1990 to Now | 15.9% | 298.7% | 30.8% |
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| Population Density | 3,511.0 | 1,617.3 | 93.4 |
| Land Area | 3.0 | 33.5 | 3,531,905.4 |
| Water Area | 0.0 | 1.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Bel Air town (Harford County), MD | Apopka, FL | United States |
| Age 0 to 4 | 3.9% | 6.4% | 5.9% |
| Age 5 to 9 | 3.9% | 6.6% | 6.1% |
| Age 10 to 14 | 4.7% | 7.2% | 6.6% |
| Age 15 to 17 | 5.2% | 4.8% | 3.9% |
| Age 18 to 20 | 2.8% | 2.0% | 4.0% |
| Age 21 to 24 | 6.3% | 5.9% | 5.2% |
| Age 25 to 34 | 11.3% | 12.6% | 13.8% |
| Age 35 to 44 | 15.1% | 13.4% | 12.9% |
| Age 45 to 54 | 10.5% | 15.5% | 12.6% |
| Age 55 to 59 | 7.1% | 5.9% | 6.7% |
| Age 60 to 64 | 7.5% | 5.1% | 6.3% |
| Age 65 to 74 | 13.1% | 9.3% | 9.6% |
| Age 75 to 84 | 5.9% | 3.4% | 4.5% |
| Age 85 and over | 2.7% | 1.9% | 1.9% |
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| Race | | | |
| | Bel Air town (Harford County), MD | Apopka, FL | United States |
| White | 78.7% | 39.2% | 59.4% |
| Black | 3.4% | 23.0% | 12.2% |
| Asian | 4.3% | 3.3% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.4% | 0.0% | 0.2% |
| Other | 1.5% | 0.5% | 0.4% |
| Two or More Races | 2.1% | 3.8% | 3.2% |
| Hispanic | 9.5% | 30.1% | 18.4% |
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| Marriage & Family | | | |
| | Bel Air town (Harford County), MD | Apopka, FL | United States |
| Married Population | 44.0% | 54.3% | 49.8% |
| Currently Married | 42.9% | 52.5% | 48.0% |
| Married but Separated | 1.0% | 1.8% | 1.8% |
| Single Population | 56.0% | 45.7% | 50.2% |
| Never Married | 34.8% | 31.2% | 33.8% |
| Divorced | 15.8% | 9.6% | 10.8% |
| Widowed | 5.5% | 4.9% | 5.6% |
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| Household Size | 2.12 | 3.06 | 2.60 |
| Households | 4,970 | 17,650 | 124,010,992 |
| Family Households | 2,401 | 13,624 | 80,755,759 |
| Married couple, w/children | 31.3% | 32.8% | 30.5% |
| Married couple, no children | 47.0% | 41.6% | 42.9% |
| Non Family Households | 2,569 | 4,026 | 43,255,233 |
| Single householder, w/children | 12.0% | 15.0% | 15.8% |
| Single householder, no children | 9.7% | 10.7% | 10.8% |