| | Warren, MN | Harvey, ND | United States |
| Population | 1,606 | 1,701 | 329,725,481 |
| Female Population | 50.8% | 54.2% | 50.5% |
| Male Population | 49.3% | 45.8% | 49.5% |
| Median Age | 36.7 | 49.3 | 38.4 |
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| Population - 2010 | 1,566 | 1,795 | 309,327,143 |
| Population - 2000 | 1,678 | 1,989 | 285,036,114 |
| Population - 1990 | 1,813 | 2,263 | 251,960,433 |
| Pop. 2000 to Now | -7.9% | -20.2% | 15.6% |
| Pop. 1990 to Now | -14.7% | -29.9% | 30.8% |
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| Population Density | 1,105.3 | 947.1 | 93.4 |
| Land Area | 1.5 | 1.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Warren, MN | Harvey, ND | United States |
| Age 0 to 4 | 7.5% | 3.9% | 5.9% |
| Age 5 to 9 | 5.9% | 6.8% | 6.1% |
| Age 10 to 14 | 6.0% | 6.4% | 6.6% |
| Age 15 to 17 | 5.0% | 3.5% | 3.9% |
| Age 18 to 20 | 2.6% | 4.4% | 4.0% |
| Age 21 to 24 | 4.9% | 1.2% | 5.2% |
| Age 25 to 34 | 15.9% | 6.9% | 13.8% |
| Age 35 to 44 | 9.9% | 10.5% | 12.9% |
| Age 45 to 54 | 6.3% | 11.3% | 12.6% |
| Age 55 to 59 | 11.0% | 8.4% | 6.7% |
| Age 60 to 64 | 6.1% | 5.9% | 6.3% |
| Age 65 to 74 | 8.2% | 12.3% | 9.6% |
| Age 75 to 84 | 6.3% | 9.5% | 4.5% |
| Age 85 and over | 4.6% | 8.9% | 1.9% |
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| Race | | | |
| | Warren, MN | Harvey, ND | United States |
| White | 89.5% | 92.4% | 59.4% |
| Black | 0.4% | 0.0% | 12.2% |
| Asian | 0.4% | 0.6% | 5.6% |
| Native American | 0.4% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.2% | 0.4% |
| Two or More Races | 2.1% | 2.4% | 3.2% |
| Hispanic | 6.8% | 4.2% | 18.4% |
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| Marriage & Family | | | |
| | Warren, MN | Harvey, ND | United States |
| Married Population | 44.4% | 44.1% | 49.8% |
| Currently Married | 44.0% | 44.1% | 48.0% |
| Married but Separated | 0.4% | 0.0% | 1.8% |
| Single Population | 55.6% | 55.9% | 50.2% |
| Never Married | 38.6% | 25.9% | 33.8% |
| Divorced | 9.1% | 11.6% | 10.8% |
| Widowed | 7.9% | 18.4% | 5.6% |
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| Household Size | 2.26 | 1.92 | 2.60 |
| Households | 688 | 838 | 124,010,992 |
| Family Households | 350 | 414 | 80,755,759 |
| Married couple, w/children | 21.4% | 22.0% | 30.5% |
| Married couple, no children | 50.6% | 53.1% | 42.9% |
| Non Family Households | 338 | 424 | 43,255,233 |
| Single householder, w/children | 23.4% | 20.5% | 15.8% |
| Single householder, no children | 4.6% | 4.3% | 10.8% |