| | Capitol Heights, MD | Suitland, MD | United States |
| Population | 4,083 | 26,375 | 329,725,481 |
| Female Population | 49.9% | 52.1% | 50.5% |
| Male Population | 50.1% | 47.9% | 49.5% |
| Median Age | 40.6 | 35.8 | 38.4 |
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| Population - 2010 | 4,311 | 25,240 | 309,327,143 |
| Population - 2000 | 4,138 | 26,861 | 285,036,114 |
| Population - 1990 | 3,633 | 26,310 | 251,960,433 |
| Pop. 2000 to Now | 9.1% | -6.9% | 15.6% |
| Pop. 1990 to Now | 24.3% | -5.0% | 30.8% |
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| Population Density | 5,227.9 | 6,211.7 | 93.4 |
| Land Area | 0.8 | 4.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Capitol Heights, MD | Suitland, MD | United States |
| Age 0 to 4 | 7.8% | 7.2% | 5.9% |
| Age 5 to 9 | 8.4% | 5.1% | 6.1% |
| Age 10 to 14 | 5.4% | 5.6% | 6.6% |
| Age 15 to 17 | 3.6% | 3.5% | 3.9% |
| Age 18 to 20 | 4.4% | 3.2% | 4.0% |
| Age 21 to 24 | 4.8% | 4.3% | 5.2% |
| Age 25 to 34 | 11.3% | 19.8% | 13.8% |
| Age 35 to 44 | 9.0% | 13.0% | 12.9% |
| Age 45 to 54 | 15.3% | 12.2% | 12.6% |
| Age 55 to 59 | 9.3% | 7.7% | 6.7% |
| Age 60 to 64 | 7.2% | 7.7% | 6.3% |
| Age 65 to 74 | 10.1% | 6.5% | 9.6% |
| Age 75 to 84 | 2.3% | 3.3% | 4.5% |
| Age 85 and over | 1.2% | 0.8% | 1.9% |
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| Race | | | |
| | Capitol Heights, MD | Suitland, MD | United States |
| White | 1.6% | 1.8% | 59.4% |
| Black | 81.8% | 89.0% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.3% | 0.4% |
| Two or More Races | 2.6% | 2.0% | 3.2% |
| Hispanic | 13.9% | 6.3% | 18.4% |
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| Marriage & Family | | | |
| | Capitol Heights, MD | Suitland, MD | United States |
| Married Population | 39.2% | 28.5% | 49.8% |
| Currently Married | 36.1% | 26.0% | 48.0% |
| Married but Separated | 3.1% | 2.5% | 1.8% |
| Single Population | 60.8% | 71.5% | 50.2% |
| Never Married | 40.6% | 53.8% | 33.8% |
| Divorced | 13.6% | 13.8% | 10.8% |
| Widowed | 6.5% | 3.9% | 5.6% |
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| Household Size | 3.04 | 2.46 | 2.60 |
| Households | 1,337 | 10,733 | 124,010,992 |
| Family Households | 903 | 6,417 | 80,755,759 |
| Married couple, w/children | 22.8% | 18.5% | 30.5% |
| Married couple, no children | 38.9% | 21.0% | 42.9% |
| Non Family Households | 434 | 4,316 | 43,255,233 |
| Single householder, w/children | 24.6% | 30.7% | 15.8% |
| Single householder, no children | 13.7% | 29.8% | 10.8% |