| | International Falls, MN | Fargo, ND | United States |
| Population | 5,859 | 124,979 | 329,725,481 |
| Female Population | 50.3% | 49.8% | 50.5% |
| Male Population | 49.7% | 50.3% | 49.5% |
| Median Age | 48.6 | 31.5 | 38.4 |
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| Population - 2010 | 6,420 | 106,024 | 309,327,143 |
| Population - 2000 | 6,703 | 90,599 | 285,036,114 |
| Population - 1990 | 8,325 | 74,111 | 251,960,433 |
| Pop. 2000 to Now | -14.8% | 38.2% | 15.6% |
| Pop. 1990 to Now | -31.4% | 69.0% | 30.8% |
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| Population Density | 914.6 | 2,512.5 | 93.4 |
| Land Area | 6.4 | 49.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | International Falls, MN | Fargo, ND | United States |
| Age 0 to 4 | 3.3% | 6.4% | 5.9% |
| Age 5 to 9 | 6.0% | 5.6% | 6.1% |
| Age 10 to 14 | 5.1% | 5.2% | 6.6% |
| Age 15 to 17 | 3.6% | 3.0% | 3.9% |
| Age 18 to 20 | 3.0% | 6.6% | 4.0% |
| Age 21 to 24 | 4.6% | 10.2% | 5.2% |
| Age 25 to 34 | 12.7% | 18.2% | 13.8% |
| Age 35 to 44 | 7.0% | 12.7% | 12.9% |
| Age 45 to 54 | 13.0% | 9.3% | 12.6% |
| Age 55 to 59 | 9.1% | 4.9% | 6.7% |
| Age 60 to 64 | 7.5% | 5.4% | 6.3% |
| Age 65 to 74 | 13.9% | 7.4% | 9.6% |
| Age 75 to 84 | 6.2% | 3.6% | 4.5% |
| Age 85 and over | 5.2% | 1.7% | 1.9% |
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| Race | | | |
| | International Falls, MN | Fargo, ND | United States |
| White | 92.8% | 80.9% | 59.4% |
| Black | 1.2% | 8.0% | 12.2% |
| Asian | 0.2% | 4.0% | 5.6% |
| Native American | 2.0% | 1.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.4% | 2.5% | 3.2% |
| Hispanic | 1.4% | 3.2% | 18.4% |
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| Marriage & Family | | | |
| | International Falls, MN | Fargo, ND | United States |
| Married Population | 43.9% | 44.4% | 49.8% |
| Currently Married | 42.1% | 43.4% | 48.0% |
| Married but Separated | 1.8% | 1.0% | 1.8% |
| Single Population | 56.1% | 55.6% | 50.2% |
| Never Married | 29.7% | 43.0% | 33.8% |
| Divorced | 17.0% | 8.6% | 10.8% |
| Widowed | 9.4% | 3.9% | 5.6% |
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| Household Size | 1.97 | 2.15 | 2.60 |
| Households | 2,846 | 55,857 | 124,010,992 |
| Family Households | 1,356 | 27,788 | 80,755,759 |
| Married couple, w/children | 25.7% | 32.3% | 30.5% |
| Married couple, no children | 48.5% | 44.5% | 42.9% |
| Non Family Households | 1,490 | 28,069 | 43,255,233 |
| Single householder, w/children | 17.4% | 15.6% | 15.8% |
| Single householder, no children | 8.4% | 7.5% | 10.8% |