| | Crofton, MD | Bel Air town (Harford County), MD | United States |
| Population | 29,812 | 10,663 | 329,725,481 |
| Female Population | 49.9% | 49.9% | 50.5% |
| Male Population | 50.1% | 50.1% | 49.5% |
| Median Age | 36.4 | 42.7 | 38.4 |
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| Population - 2010 | 27,624 | 10,149 | 309,327,143 |
| Population - 2000 | 20,091 | 10,080 | 285,036,114 |
| Population - 1990 | 12,781 | 8,860 | 251,960,433 |
| Pop. 2000 to Now | 45.7% | 1.9% | 15.6% |
| Pop. 1990 to Now | 129.0% | 15.9% | 30.8% |
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| Population Density | 4,508.1 | 3,511.0 | 93.4 |
| Land Area | 6.6 | 3.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Crofton, MD | Bel Air town (Harford County), MD | United States |
| Age 0 to 4 | 6.9% | 3.9% | 5.9% |
| Age 5 to 9 | 7.6% | 3.9% | 6.1% |
| Age 10 to 14 | 10.4% | 4.7% | 6.6% |
| Age 15 to 17 | 4.3% | 5.2% | 3.9% |
| Age 18 to 20 | 3.1% | 2.8% | 4.0% |
| Age 21 to 24 | 2.7% | 6.3% | 5.2% |
| Age 25 to 34 | 13.5% | 11.3% | 13.8% |
| Age 35 to 44 | 15.9% | 15.1% | 12.9% |
| Age 45 to 54 | 14.0% | 10.5% | 12.6% |
| Age 55 to 59 | 5.9% | 7.1% | 6.7% |
| Age 60 to 64 | 4.7% | 7.5% | 6.3% |
| Age 65 to 74 | 7.0% | 13.1% | 9.6% |
| Age 75 to 84 | 3.7% | 5.9% | 4.5% |
| Age 85 and over | 0.5% | 2.7% | 1.9% |
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| Race | | | |
| | Crofton, MD | Bel Air town (Harford County), MD | United States |
| White | 62.4% | 78.7% | 59.4% |
| Black | 15.2% | 3.4% | 12.2% |
| Asian | 8.5% | 4.3% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.1% | 1.5% | 0.4% |
| Two or More Races | 5.8% | 2.1% | 3.2% |
| Hispanic | 8.0% | 9.5% | 18.4% |
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| Marriage & Family | | | |
| | Crofton, MD | Bel Air town (Harford County), MD | United States |
| Married Population | 56.9% | 44.0% | 49.8% |
| Currently Married | 55.7% | 42.9% | 48.0% |
| Married but Separated | 1.3% | 1.0% | 1.8% |
| Single Population | 43.1% | 56.0% | 50.2% |
| Never Married | 28.4% | 34.8% | 33.8% |
| Divorced | 10.4% | 15.8% | 10.8% |
| Widowed | 4.3% | 5.5% | 5.6% |
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| Household Size | 2.83 | 2.12 | 2.60 |
| Households | 10,483 | 4,970 | 124,010,992 |
| Family Households | 7,738 | 2,401 | 80,755,759 |
| Married couple, w/children | 40.8% | 31.3% | 30.5% |
| Married couple, no children | 35.2% | 47.0% | 42.9% |
| Non Family Households | 2,745 | 2,569 | 43,255,233 |
| Single householder, w/children | 16.9% | 12.0% | 15.8% |
| Single householder, no children | 7.1% | 9.7% | 10.8% |