| | Clinton, MD | Harrisburg, PA | United States |
| Population | 39,925 | 49,969 | 329,725,481 |
| Female Population | 50.4% | 51.5% | 50.5% |
| Male Population | 49.6% | 48.5% | 49.5% |
| Median Age | 43.9 | 31.6 | 38.4 |
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| Population - 2010 | 35,985 | 49,513 | 309,327,143 |
| Population - 2000 | 26,064 | 48,950 | 285,036,114 |
| Population - 1990 | 19,987 | 52,376 | 251,960,433 |
| Pop. 2000 to Now | 51.0% | 0.8% | 15.6% |
| Pop. 1990 to Now | 96.9% | -5.8% | 30.8% |
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| Population Density | 1,596.1 | 6,154.6 | 93.4 |
| Land Area | 25.0 | 8.1 | 3,531,905.4 |
| Water Area | 0.1 | 3.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Clinton, MD | Harrisburg, PA | United States |
| Age 0 to 4 | 3.9% | 8.6% | 5.9% |
| Age 5 to 9 | 5.6% | 8.1% | 6.1% |
| Age 10 to 14 | 6.9% | 8.6% | 6.6% |
| Age 15 to 17 | 3.7% | 3.6% | 3.9% |
| Age 18 to 20 | 3.8% | 3.4% | 4.0% |
| Age 21 to 24 | 4.6% | 5.7% | 5.2% |
| Age 25 to 34 | 10.2% | 17.4% | 13.8% |
| Age 35 to 44 | 12.8% | 11.1% | 12.9% |
| Age 45 to 54 | 15.5% | 11.2% | 12.6% |
| Age 55 to 59 | 7.9% | 6.7% | 6.7% |
| Age 60 to 64 | 7.7% | 4.8% | 6.3% |
| Age 65 to 74 | 11.8% | 6.5% | 9.6% |
| Age 75 to 84 | 4.4% | 3.4% | 4.5% |
| Age 85 and over | 1.3% | 0.9% | 1.9% |
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| Race | | | |
| | Clinton, MD | Harrisburg, PA | United States |
| White | 7.4% | 24.4% | 59.4% |
| Black | 78.0% | 44.0% | 12.2% |
| Asian | 2.4% | 2.6% | 5.6% |
| Native American | 0.5% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 3.6% | 3.3% | 3.2% |
| Hispanic | 7.9% | 25.1% | 18.4% |
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| Marriage & Family | | | |
| | Clinton, MD | Harrisburg, PA | United States |
| Married Population | 46.6% | 31.4% | 49.8% |
| Currently Married | 45.2% | 27.3% | 48.0% |
| Married but Separated | 1.4% | 4.2% | 1.8% |
| Single Population | 53.4% | 68.6% | 50.2% |
| Never Married | 36.6% | 49.4% | 33.8% |
| Divorced | 10.4% | 13.0% | 10.8% |
| Widowed | 6.4% | 6.1% | 5.6% |
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| Household Size | 2.92 | 2.33 | 2.60 |
| Households | 13,456 | 20,953 | 124,010,992 |
| Family Households | 9,854 | 10,507 | 80,755,759 |
| Married couple, w/children | 29.5% | 15.0% | 30.5% |
| Married couple, no children | 37.1% | 26.1% | 42.9% |
| Non Family Households | 3,602 | 10,446 | 43,255,233 |
| Single householder, w/children | 17.2% | 40.0% | 15.8% |
| Single householder, no children | 16.2% | 18.9% | 10.8% |