| | Cumberland, MD | Hopkinsville, KY | United States |
| Population | 19,028 | 30,771 | 329,725,481 |
| Female Population | 51.5% | 50.6% | 50.5% |
| Male Population | 48.6% | 49.4% | 49.5% |
| Median Age | 40.7 | 36.2 | 38.4 |
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| Population - 2010 | 20,808 | 32,070 | 309,327,143 |
| Population - 2000 | 21,518 | 30,089 | 285,036,114 |
| Population - 1990 | 23,706 | 29,809 | 251,960,433 |
| Pop. 2000 to Now | -11.1% | 2.7% | 15.6% |
| Pop. 1990 to Now | -19.3% | 3.7% | 30.8% |
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| Population Density | 1,892.6 | 970.9 | 93.4 |
| Land Area | 10.1 | 31.7 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Cumberland, MD | Hopkinsville, KY | United States |
| Age 0 to 4 | 5.1% | 5.6% | 5.9% |
| Age 5 to 9 | 5.6% | 7.4% | 6.1% |
| Age 10 to 14 | 6.4% | 7.5% | 6.6% |
| Age 15 to 17 | 3.2% | 3.8% | 3.9% |
| Age 18 to 20 | 7.0% | 3.1% | 4.0% |
| Age 21 to 24 | 5.2% | 6.6% | 5.2% |
| Age 25 to 34 | 10.0% | 14.0% | 13.8% |
| Age 35 to 44 | 12.3% | 11.7% | 12.9% |
| Age 45 to 54 | 10.7% | 11.3% | 12.6% |
| Age 55 to 59 | 5.4% | 6.0% | 6.7% |
| Age 60 to 64 | 6.6% | 6.1% | 6.3% |
| Age 65 to 74 | 11.9% | 8.9% | 9.6% |
| Age 75 to 84 | 6.9% | 5.3% | 4.5% |
| Age 85 and over | 3.8% | 2.6% | 1.9% |
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| Race | | | |
| | Cumberland, MD | Hopkinsville, KY | United States |
| White | 88.9% | 62.4% | 59.4% |
| Black | 4.3% | 27.3% | 12.2% |
| Asian | 0.7% | 2.0% | 5.6% |
| Native American | 0.1% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.2% | 0.3% | 0.4% |
| Two or More Races | 3.8% | 5.3% | 3.2% |
| Hispanic | 2.1% | 2.0% | 18.4% |
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| Marriage & Family | | | |
| | Cumberland, MD | Hopkinsville, KY | United States |
| Married Population | 39.6% | 40.8% | 49.8% |
| Currently Married | 37.5% | 36.7% | 48.0% |
| Married but Separated | 2.1% | 4.1% | 1.8% |
| Single Population | 60.4% | 59.2% | 50.2% |
| Never Married | 32.9% | 34.3% | 33.8% |
| Divorced | 17.8% | 17.9% | 10.8% |
| Widowed | 9.6% | 7.1% | 5.6% |
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| Household Size | 2.11 | 2.27 | 2.60 |
| Households | 8,429 | 12,824 | 124,010,992 |
| Family Households | 4,276 | 7,331 | 80,755,759 |
| Married couple, w/children | 24.8% | 21.2% | 30.5% |
| Married couple, no children | 39.7% | 31.8% | 42.9% |
| Non Family Households | 4,153 | 5,493 | 43,255,233 |
| Single householder, w/children | 26.5% | 32.2% | 15.8% |
| Single householder, no children | 9.0% | 14.8% | 10.8% |