| | Gravois Mills, MO | Owatonna, MN | United States |
| Population | 182 | 26,366 | 329,725,481 |
| Female Population | 46.7% | 50.0% | 50.5% |
| Male Population | 53.3% | 50.0% | 49.5% |
| Median Age | 33.5 | 39.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 148 | 25,560 | 309,327,143 |
| Population - 2000 | 208 | 22,434 | 285,036,114 |
| Population - 1990 | 101 | 19,386 | 251,960,433 |
| Pop. 2000 to Now | -28.9% | 14.4% | 15.6% |
| Pop. 1990 to Now | 46.5% | 32.4% | 30.8% |
| space4 | | | |
| Population Density | 245.3 | 1,813.8 | 93.4 |
| Land Area | 0.7 | 14.5 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Gravois Mills, MO | Owatonna, MN | United States |
| Age 0 to 4 | 8.2% | 5.1% | 5.9% |
| Age 5 to 9 | 6.0% | 5.7% | 6.1% |
| Age 10 to 14 | 4.9% | 8.9% | 6.6% |
| Age 15 to 17 | 3.8% | 4.9% | 3.9% |
| Age 18 to 20 | 2.2% | 3.8% | 4.0% |
| Age 21 to 24 | 8.8% | 4.2% | 5.2% |
| Age 25 to 34 | 20.9% | 11.2% | 13.8% |
| Age 35 to 44 | 1.1% | 12.6% | 12.9% |
| Age 45 to 54 | 23.6% | 13.2% | 12.6% |
| Age 55 to 59 | 2.7% | 7.2% | 6.7% |
| Age 60 to 64 | 8.2% | 5.2% | 6.3% |
| Age 65 to 74 | 8.2% | 10.4% | 9.6% |
| Age 75 to 84 | 1.1% | 4.5% | 4.5% |
| Age 85 and over | 0.0% | 3.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Gravois Mills, MO | Owatonna, MN | United States |
| White | 91.8% | 85.5% | 59.4% |
| Black | 2.2% | 4.5% | 12.2% |
| Asian | 0.0% | 0.1% | 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 | 6.0% | 3.3% | 3.2% |
| Hispanic | 0.0% | 6.7% | 18.4% |
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| Marriage & Family | | | |
| | Gravois Mills, MO | Owatonna, MN | United States |
| Married Population | 46.3% | 55.9% | 49.8% |
| Currently Married | 40.1% | 55.1% | 48.0% |
| Married but Separated | 6.1% | 0.8% | 1.8% |
| Single Population | 53.7% | 44.1% | 50.2% |
| Never Married | 23.1% | 27.6% | 33.8% |
| Divorced | 27.2% | 9.9% | 10.8% |
| Widowed | 3.4% | 6.7% | 5.6% |
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| Household Size | 2.84 | 2.39 | 2.60 |
| Households | 64 | 10,830 | 124,010,992 |
| Family Households | 47 | 6,794 | 80,755,759 |
| Married couple, w/children | 6.4% | 37.4% | 30.5% |
| Married couple, no children | 46.8% | 46.6% | 42.9% |
| Non Family Households | 17 | 4,036 | 43,255,233 |
| Single householder, w/children | 42.6% | 10.5% | 15.8% |
| Single householder, no children | 4.3% | 5.5% | 10.8% |