| | Oak Grove, MN | Sumpter, OR | United States |
| Population | 8,870 | 237 | 329,725,481 |
| Female Population | 50.7% | 46.4% | 50.5% |
| Male Population | 49.3% | 53.6% | 49.5% |
| Median Age | 43 | 71.5 | 38.4 |
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| Population - 2010 | 8,057 | 206 | 309,327,143 |
| Population - 2000 | 6,903 | 171 | 285,036,114 |
| Population - 1990 | 5,441 | 119 | 251,960,433 |
| Pop. 2000 to Now | 30.8% | 22.8% | 15.6% |
| Pop. 1990 to Now | 65.9% | 76.5% | 30.8% |
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| Population Density | 261.5 | 108.6 | 93.4 |
| Land Area | 33.9 | 2.2 | 3,531,905.4 |
| Water Area | 1.3 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Oak Grove, MN | Sumpter, OR | United States |
| Age 0 to 4 | 5.5% | 0.0% | 5.9% |
| Age 5 to 9 | 7.1% | 0.0% | 6.1% |
| Age 10 to 14 | 6.6% | 0.0% | 6.6% |
| Age 15 to 17 | 4.5% | 0.0% | 3.9% |
| Age 18 to 20 | 3.7% | 0.0% | 4.0% |
| Age 21 to 24 | 4.0% | 0.0% | 5.2% |
| Age 25 to 34 | 7.5% | 2.5% | 13.8% |
| Age 35 to 44 | 13.6% | 3.0% | 12.9% |
| Age 45 to 54 | 14.2% | 2.1% | 12.6% |
| Age 55 to 59 | 9.2% | 6.3% | 6.7% |
| Age 60 to 64 | 10.9% | 1.7% | 6.3% |
| Age 65 to 74 | 10.2% | 62.4% | 9.6% |
| Age 75 to 84 | 2.3% | 20.3% | 4.5% |
| Age 85 and over | 0.8% | 1.7% | 1.9% |
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| Race | | | |
| | Oak Grove, MN | Sumpter, OR | United States |
| White | 90.7% | 98.3% | 59.4% |
| Black | 1.4% | 0.0% | 12.2% |
| Asian | 3.9% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.0% | 0.4% |
| Two or More Races | 3.0% | 0.4% | 3.2% |
| Hispanic | 0.7% | 1.3% | 18.4% |
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| Marriage & Family | | | |
| | Oak Grove, MN | Sumpter, OR | United States |
| Married Population | 66.1% | 71.7% | 49.8% |
| Currently Married | 65.2% | 67.9% | 48.0% |
| Married but Separated | 1.0% | 3.8% | 1.8% |
| Single Population | 33.9% | 28.3% | 50.2% |
| Never Married | 24.1% | 4.6% | 33.8% |
| Divorced | 6.5% | 15.2% | 10.8% |
| Widowed | 3.3% | 8.4% | 5.6% |
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| Household Size | 2.86 | 1.80 | 2.60 |
| Households | 3,101 | 132 | 124,010,992 |
| Family Households | 2,599 | 84 | 80,755,759 |
| Married couple, w/children | 31.5% | 0.0% | 30.5% |
| Married couple, no children | 58.4% | 95.2% | 42.9% |
| Non Family Households | 502 | 48 | 43,255,233 |
| Single householder, w/children | 3.2% | 0.0% | 15.8% |
| Single householder, no children | 6.8% | 4.8% | 10.8% |