| | St. Francis, MN | Oak Grove, MN | United States |
| Population | 8,099 | 8,870 | 329,725,481 |
| Female Population | 48.2% | 50.7% | 50.5% |
| Male Population | 51.9% | 49.3% | 49.5% |
| Median Age | 34 | 43 | 38.4 |
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| Population - 2010 | 7,227 | 8,057 | 309,327,143 |
| Population - 2000 | 4,910 | 6,903 | 285,036,114 |
| Population - 1990 | 2,538 | 5,441 | 251,960,433 |
| Pop. 2000 to Now | 64.3% | 30.8% | 15.6% |
| Pop. 1990 to Now | 217.8% | 65.9% | 30.8% |
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| Population Density | 348.0 | 261.5 | 93.4 |
| Land Area | 23.3 | 33.9 | 3,531,905.4 |
| Water Area | 0.4 | 1.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | St. Francis, MN | Oak Grove, MN | United States |
| Age 0 to 4 | 9.9% | 5.5% | 5.9% |
| Age 5 to 9 | 8.5% | 7.1% | 6.1% |
| Age 10 to 14 | 8.4% | 6.6% | 6.6% |
| Age 15 to 17 | 3.5% | 4.5% | 3.9% |
| Age 18 to 20 | 2.0% | 3.7% | 4.0% |
| Age 21 to 24 | 5.4% | 4.0% | 5.2% |
| Age 25 to 34 | 13.5% | 7.5% | 13.8% |
| Age 35 to 44 | 15.7% | 13.6% | 12.9% |
| Age 45 to 54 | 13.8% | 14.2% | 12.6% |
| Age 55 to 59 | 5.3% | 9.2% | 6.7% |
| Age 60 to 64 | 4.9% | 10.9% | 6.3% |
| Age 65 to 74 | 4.3% | 10.2% | 9.6% |
| Age 75 to 84 | 3.0% | 2.3% | 4.5% |
| Age 85 and over | 1.8% | 0.8% | 1.9% |
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| Race | | | |
| | St. Francis, MN | Oak Grove, MN | United States |
| White | 89.3% | 90.7% | 59.4% |
| Black | 1.6% | 1.4% | 12.2% |
| Asian | 0.5% | 3.9% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.4% | 0.4% |
| Two or More Races | 5.5% | 3.0% | 3.2% |
| Hispanic | 3.1% | 0.7% | 18.4% |
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| Marriage & Family | | | |
| | St. Francis, MN | Oak Grove, MN | United States |
| Married Population | 48.2% | 66.1% | 49.8% |
| Currently Married | 47.1% | 65.2% | 48.0% |
| Married but Separated | 1.2% | 1.0% | 1.8% |
| Single Population | 51.8% | 33.9% | 50.2% |
| Never Married | 34.9% | 24.1% | 33.8% |
| Divorced | 13.8% | 6.5% | 10.8% |
| Widowed | 3.1% | 3.3% | 5.6% |
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| Household Size | 2.95 | 2.86 | 2.60 |
| Households | 2,745 | 3,101 | 124,010,992 |
| Family Households | 1,929 | 2,599 | 80,755,759 |
| Married couple, w/children | 32.7% | 31.5% | 30.5% |
| Married couple, no children | 33.0% | 58.4% | 42.9% |
| Non Family Households | 816 | 502 | 43,255,233 |
| Single householder, w/children | 23.3% | 3.2% | 15.8% |
| Single householder, no children | 10.9% | 6.8% | 10.8% |