| | Hampstead, MD | Hagerstown, MD | United States |
| Population | 6,273 | 43,015 | 329,725,481 |
| Female Population | 55.8% | 52.4% | 50.5% |
| Male Population | 44.2% | 47.7% | 49.5% |
| Median Age | 37.6 | 35.6 | 38.4 |
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| Population - 2010 | 6,319 | 39,680 | 309,327,143 |
| Population - 2000 | 5,060 | 36,687 | 285,036,114 |
| Population - 1990 | 2,608 | 35,445 | 251,960,433 |
| Pop. 2000 to Now | 27.0% | 8.8% | 15.6% |
| Pop. 1990 to Now | 146.4% | 12.6% | 30.8% |
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| Population Density | 1,935.5 | 3,535.7 | 93.4 |
| Land Area | 3.2 | 12.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Hampstead, MD | Hagerstown, MD | United States |
| Age 0 to 4 | 5.3% | 7.8% | 5.9% |
| Age 5 to 9 | 4.1% | 8.4% | 6.1% |
| Age 10 to 14 | 5.7% | 6.3% | 6.6% |
| Age 15 to 17 | 4.6% | 3.8% | 3.9% |
| Age 18 to 20 | 3.0% | 3.0% | 4.0% |
| Age 21 to 24 | 5.7% | 4.4% | 5.2% |
| Age 25 to 34 | 15.9% | 15.3% | 13.8% |
| Age 35 to 44 | 9.8% | 12.2% | 12.9% |
| Age 45 to 54 | 14.3% | 13.1% | 12.6% |
| Age 55 to 59 | 11.7% | 5.6% | 6.7% |
| Age 60 to 64 | 5.5% | 5.7% | 6.3% |
| Age 65 to 74 | 9.5% | 7.8% | 9.6% |
| Age 75 to 84 | 3.3% | 4.7% | 4.5% |
| Age 85 and over | 1.7% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hampstead, MD | Hagerstown, MD | United States |
| White | 87.6% | 63.1% | 59.4% |
| Black | 1.4% | 17.8% | 12.2% |
| Asian | 5.7% | 1.9% | 5.6% |
| Native American | 0.3% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 1.8% | 0.4% | 0.4% |
| Two or More Races | 1.8% | 7.8% | 3.2% |
| Hispanic | 1.3% | 8.8% | 18.4% |
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| Marriage & Family | | | |
| | Hampstead, MD | Hagerstown, MD | United States |
| Married Population | 49.2% | 40.5% | 49.8% |
| Currently Married | 48.2% | 37.4% | 48.0% |
| Married but Separated | 1.0% | 3.1% | 1.8% |
| Single Population | 50.8% | 59.5% | 50.2% |
| Never Married | 29.1% | 37.3% | 33.8% |
| Divorced | 16.3% | 16.0% | 10.8% |
| Widowed | 5.4% | 6.3% | 5.6% |
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| Household Size | 2.37 | 2.29 | 2.60 |
| Households | 2,652 | 18,372 | 124,010,992 |
| Family Households | 1,663 | 9,994 | 80,755,759 |
| Married couple, w/children | 26.4% | 26.6% | 30.5% |
| Married couple, no children | 44.7% | 30.0% | 42.9% |
| Non Family Households | 989 | 8,378 | 43,255,233 |
| Single householder, w/children | 15.6% | 31.5% | 15.8% |
| Single householder, no children | 13.3% | 12.0% | 10.8% |