| | Dickinson, ND | Wahpeton, ND | United States |
| Population | 24,851 | 7,928 | 329,725,481 |
| Female Population | 48.0% | 46.6% | 50.5% |
| Male Population | 52.0% | 53.4% | 49.5% |
| Median Age | 32.9 | 33.9 | 38.4 |
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| Population - 2010 | 17,994 | 7,762 | 309,327,143 |
| Population - 2000 | 16,010 | 8,586 | 285,036,114 |
| Population - 1990 | 16,097 | 8,751 | 251,960,433 |
| Pop. 2000 to Now | 47.0% | -10.0% | 15.6% |
| Pop. 1990 to Now | 46.2% | -11.7% | 30.8% |
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| Population Density | 1,758.0 | 1,520.2 | 93.4 |
| Land Area | 14.1 | 5.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Dickinson, ND | Wahpeton, ND | United States |
| Age 0 to 4 | 8.6% | 5.2% | 5.9% |
| Age 5 to 9 | 8.6% | 3.8% | 6.1% |
| Age 10 to 14 | 5.7% | 5.0% | 6.6% |
| Age 15 to 17 | 4.0% | 2.5% | 3.9% |
| Age 18 to 20 | 3.3% | 15.5% | 4.0% |
| Age 21 to 24 | 6.4% | 8.1% | 5.2% |
| Age 25 to 34 | 17.6% | 11.5% | 13.8% |
| Age 35 to 44 | 12.3% | 8.2% | 12.9% |
| Age 45 to 54 | 11.0% | 7.7% | 12.6% |
| Age 55 to 59 | 6.1% | 6.7% | 6.7% |
| Age 60 to 64 | 4.7% | 9.0% | 6.3% |
| Age 65 to 74 | 5.6% | 9.7% | 9.6% |
| Age 75 to 84 | 3.7% | 4.4% | 4.5% |
| Age 85 and over | 2.3% | 3.0% | 1.9% |
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| Race | | | |
| | Dickinson, ND | Wahpeton, ND | United States |
| White | 84.5% | 88.5% | 59.4% |
| Black | 2.7% | 1.4% | 12.2% |
| Asian | 1.4% | 0.4% | 5.6% |
| Native American | 1.6% | 1.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.6% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.2% | 3.8% | 3.2% |
| Hispanic | 7.0% | 4.0% | 18.4% |
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| Marriage & Family | | | |
| | Dickinson, ND | Wahpeton, ND | United States |
| Married Population | 50.4% | 36.8% | 49.8% |
| Currently Married | 49.6% | 35.3% | 48.0% |
| Married but Separated | 0.8% | 1.5% | 1.8% |
| Single Population | 49.6% | 63.2% | 50.2% |
| Never Married | 32.5% | 43.1% | 33.8% |
| Divorced | 10.5% | 11.7% | 10.8% |
| Widowed | 6.6% | 8.4% | 5.6% |
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| Household Size | 2.37 | 2.08 | 2.60 |
| Households | 10,216 | 3,280 | 124,010,992 |
| Family Households | 5,761 | 1,593 | 80,755,759 |
| Married couple, w/children | 36.2% | 23.9% | 30.5% |
| Married couple, no children | 40.8% | 47.0% | 42.9% |
| Non Family Households | 4,455 | 1,687 | 43,255,233 |
| Single householder, w/children | 14.6% | 20.3% | 15.8% |
| Single householder, no children | 8.3% | 8.8% | 10.8% |