| | Gardner, ND | Nisswa, MN | United States |
| Population | 72 | 1,730 | 329,725,481 |
| Female Population | 55.6% | 45.7% | 50.5% |
| Male Population | 44.4% | 54.3% | 49.5% |
| Median Age | 36.2 | 51.8 | 38.4 |
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| Population - 2010 | 74 | 1,968 | 309,327,143 |
| Population - 2000 | 80 | 1,953 | 285,036,114 |
| Population - 1990 | 85 | 1,391 | 251,960,433 |
| Pop. 2000 to Now | -8.8% | 8.3% | 15.6% |
| Pop. 1990 to Now | -14.1% | 52.1% | 30.8% |
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| Population Density | 144.9 | 160.6 | 93.4 |
| Land Area | 0.5 | 10.8 | 3,531,905.4 |
| Water Area | 0.0 | 7.6 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Gardner, ND | Nisswa, MN | United States |
| Age 0 to 4 | 5.6% | 4.3% | 5.9% |
| Age 5 to 9 | 13.9% | 3.6% | 6.1% |
| Age 10 to 14 | 12.5% | 4.6% | 6.6% |
| Age 15 to 17 | 0.0% | 4.9% | 3.9% |
| Age 18 to 20 | 5.6% | 3.5% | 4.0% |
| Age 21 to 24 | 0.0% | 7.1% | 5.2% |
| Age 25 to 34 | 9.7% | 3.9% | 13.8% |
| Age 35 to 44 | 18.1% | 11.1% | 12.9% |
| Age 45 to 54 | 15.3% | 13.1% | 12.6% |
| Age 55 to 59 | 0.0% | 11.7% | 6.7% |
| Age 60 to 64 | 5.6% | 7.4% | 6.3% |
| Age 65 to 74 | 13.9% | 12.8% | 9.6% |
| Age 75 to 84 | 0.0% | 9.7% | 4.5% |
| Age 85 and over | 0.0% | 2.2% | 1.9% |
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| Race | | | |
| | Gardner, ND | Nisswa, MN | United States |
| White | 100.0% | 95.0% | 59.4% |
| Black | 0.0% | 1.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 3.2% | 3.2% |
| Hispanic | 0.0% | 0.6% | 18.4% |
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| Marriage & Family | | | |
| | Gardner, ND | Nisswa, MN | United States |
| Married Population | 67.3% | 59.7% | 49.8% |
| Currently Married | 67.3% | 59.3% | 48.0% |
| Married but Separated | 0.0% | 0.4% | 1.8% |
| Single Population | 32.7% | 40.3% | 50.2% |
| Never Married | 14.3% | 23.0% | 33.8% |
| Divorced | 16.3% | 10.6% | 10.8% |
| Widowed | 2.0% | 6.7% | 5.6% |
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| Household Size | 2.77 | 2.47 | 2.60 |
| Households | 26 | 700 | 124,010,992 |
| Family Households | 19 | 489 | 80,755,759 |
| Married couple, w/children | 52.6% | 30.7% | 30.5% |
| Married couple, no children | 26.3% | 57.3% | 42.9% |
| Non Family Households | 7 | 211 | 43,255,233 |
| Single householder, w/children | 21.1% | 3.5% | 15.8% |
| Single householder, no children | 0.0% | 8.6% | 10.8% |