| | Oak Grove, SC | Conway, SC | United States |
| Population | 11,803 | 22,001 | 329,725,481 |
| Female Population | 51.7% | 54.4% | 50.5% |
| Male Population | 48.3% | 45.6% | 49.5% |
| Median Age | 37.9 | 35.6 | 38.4 |
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| Population - 2010 | 10,479 | 17,378 | 309,327,143 |
| Population - 2000 | 8,183 | 11,788 | 285,036,114 |
| Population - 1990 | 6,989 | 9,819 | 251,960,433 |
| Pop. 2000 to Now | 36.7% | 125.8% | 15.6% |
| Pop. 1990 to Now | 60.1% | 171.1% | 30.8% |
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| Population Density | 1,836.2 | 981.6 | 93.4 |
| Land Area | 6.4 | 22.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.8 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Oak Grove, SC | Conway, SC | United States |
| Age 0 to 4 | 5.3% | 4.2% | 5.9% |
| Age 5 to 9 | 6.5% | 4.8% | 6.1% |
| Age 10 to 14 | 4.7% | 5.0% | 6.6% |
| Age 15 to 17 | 4.1% | 3.5% | 3.9% |
| Age 18 to 20 | 2.0% | 14.5% | 4.0% |
| Age 21 to 24 | 2.5% | 5.8% | 5.2% |
| Age 25 to 34 | 19.0% | 11.8% | 13.8% |
| Age 35 to 44 | 14.3% | 8.9% | 12.9% |
| Age 45 to 54 | 11.0% | 10.4% | 12.6% |
| Age 55 to 59 | 7.2% | 6.4% | 6.7% |
| Age 60 to 64 | 7.0% | 6.5% | 6.3% |
| Age 65 to 74 | 9.8% | 12.5% | 9.6% |
| Age 75 to 84 | 4.3% | 4.5% | 4.5% |
| Age 85 and over | 2.1% | 1.3% | 1.9% |
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| Race | | | |
| | Oak Grove, SC | Conway, SC | United States |
| White | 69.7% | 59.9% | 59.4% |
| Black | 15.3% | 34.0% | 12.2% |
| Asian | 1.6% | 0.6% | 5.6% |
| Native American | 0.7% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 1.4% | 0.4% |
| Two or More Races | 3.8% | 2.0% | 3.2% |
| Hispanic | 8.6% | 2.2% | 18.4% |
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| Marriage & Family | | | |
| | Oak Grove, SC | Conway, SC | United States |
| Married Population | 45.9% | 38.5% | 49.8% |
| Currently Married | 44.6% | 35.6% | 48.0% |
| Married but Separated | 1.4% | 2.9% | 1.8% |
| Single Population | 54.1% | 61.5% | 50.2% |
| Never Married | 35.3% | 46.5% | 33.8% |
| Divorced | 12.9% | 7.8% | 10.8% |
| Widowed | 5.9% | 7.2% | 5.6% |
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| Household Size | 2.34 | 2.61 | 2.60 |
| Households | 5,024 | 7,121 | 124,010,992 |
| Family Households | 3,035 | 4,274 | 80,755,759 |
| Married couple, w/children | 22.6% | 20.7% | 30.5% |
| Married couple, no children | 45.3% | 46.4% | 42.9% |
| Non Family Households | 1,989 | 2,847 | 43,255,233 |
| Single householder, w/children | 19.8% | 21.4% | 15.8% |
| Single householder, no children | 12.2% | 11.6% | 10.8% |