| | Waldorf, MD | Wellington, FL | United States |
| Population | 79,190 | 61,445 | 329,725,481 |
| Female Population | 53.1% | 51.7% | 50.5% |
| Male Population | 46.9% | 48.3% | 49.5% |
| Median Age | 36.3 | 41.3 | 38.4 |
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| Population - 2010 | 67,143 | 56,831 | 309,327,143 |
| Population - 2000 | 22,312 | 38,216 | 285,036,114 |
| Population - 1990 | 15,058 | 20,670 | 251,960,433 |
| Pop. 2000 to Now | 246.4% | 71.3% | 15.6% |
| Pop. 1990 to Now | 413.3% | 216.7% | 30.8% |
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| Population Density | 2,184.0 | 1,356.7 | 93.4 |
| Land Area | 36.3 | 45.3 | 3,531,905.4 |
| Water Area | 0.2 | 0.4 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Waldorf, MD | Wellington, FL | United States |
| Age 0 to 4 | 5.9% | 4.7% | 5.9% |
| Age 5 to 9 | 7.8% | 6.6% | 6.1% |
| Age 10 to 14 | 7.0% | 8.7% | 6.6% |
| Age 15 to 17 | 4.2% | 5.1% | 3.9% |
| Age 18 to 20 | 3.3% | 3.5% | 4.0% |
| Age 21 to 24 | 5.1% | 4.2% | 5.2% |
| Age 25 to 34 | 14.9% | 9.7% | 13.8% |
| Age 35 to 44 | 14.7% | 12.3% | 12.9% |
| Age 45 to 54 | 14.4% | 15.3% | 12.6% |
| Age 55 to 59 | 6.1% | 7.1% | 6.7% |
| Age 60 to 64 | 6.1% | 6.1% | 6.3% |
| Age 65 to 74 | 7.0% | 9.9% | 9.6% |
| Age 75 to 84 | 2.5% | 5.1% | 4.5% |
| Age 85 and over | 1.0% | 1.7% | 1.9% |
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| Race | | | |
| | Waldorf, MD | Wellington, FL | United States |
| White | 21.1% | 55.5% | 59.4% |
| Black | 61.0% | 10.6% | 12.2% |
| Asian | 3.5% | 3.7% | 5.6% |
| Native American | 0.4% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.6% | 0.6% | 0.4% |
| Two or More Races | 5.2% | 1.6% | 3.2% |
| Hispanic | 8.2% | 27.9% | 18.4% |
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| Marriage & Family | | | |
| | Waldorf, MD | Wellington, FL | United States |
| Married Population | 46.6% | 58.4% | 49.8% |
| Currently Married | 44.6% | 57.4% | 48.0% |
| Married but Separated | 1.9% | 1.0% | 1.8% |
| Single Population | 53.4% | 41.6% | 50.2% |
| Never Married | 38.6% | 27.9% | 33.8% |
| Divorced | 11.0% | 9.4% | 10.8% |
| Widowed | 3.9% | 4.4% | 5.6% |
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| Household Size | 2.74 | 2.95 | 2.60 |
| Households | 28,852 | 20,805 | 124,010,992 |
| Family Households | 20,507 | 16,277 | 80,755,759 |
| Married couple, w/children | 30.6% | 38.6% | 30.5% |
| Married couple, no children | 33.4% | 41.8% | 42.9% |
| Non Family Households | 8,345 | 4,528 | 43,255,233 |
| Single householder, w/children | 22.8% | 12.7% | 15.8% |
| Single householder, no children | 13.3% | 6.9% | 10.8% |