| | Barnwell, SC | Albany, GA | United States |
| Population | 4,526 | 70,748 | 329,725,481 |
| Female Population | 56.2% | 53.6% | 50.5% |
| Male Population | 43.8% | 46.4% | 49.5% |
| Median Age | 32.4 | 34.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,764 | 77,421 | 309,327,143 |
| Population - 2000 | 5,035 | 76,939 | 285,036,114 |
| Population - 1990 | 5,255 | 78,122 | 251,960,433 |
| Pop. 2000 to Now | -15.4% | -7.9% | 15.6% |
| Pop. 1990 to Now | -18.9% | -9.3% | 30.8% |
| space4 | | | |
| Population Density | 577.2 | 1,284.8 | 93.4 |
| Land Area | 7.8 | 55.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.8 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Barnwell, SC | Albany, GA | United States |
| Age 0 to 4 | 7.9% | 6.4% | 5.9% |
| Age 5 to 9 | 7.4% | 6.5% | 6.1% |
| Age 10 to 14 | 7.4% | 7.1% | 6.6% |
| Age 15 to 17 | 2.5% | 3.7% | 3.9% |
| Age 18 to 20 | 7.4% | 6.0% | 4.0% |
| Age 21 to 24 | 8.4% | 6.5% | 5.2% |
| Age 25 to 34 | 11.8% | 14.4% | 13.8% |
| Age 35 to 44 | 9.4% | 11.5% | 12.9% |
| Age 45 to 54 | 12.3% | 10.5% | 12.6% |
| Age 55 to 59 | 5.0% | 5.7% | 6.7% |
| Age 60 to 64 | 4.9% | 6.2% | 6.3% |
| Age 65 to 74 | 8.0% | 9.4% | 9.6% |
| Age 75 to 84 | 5.2% | 4.0% | 4.5% |
| Age 85 and over | 2.3% | 2.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Barnwell, SC | Albany, GA | United States |
| White | 40.9% | 20.3% | 59.4% |
| Black | 57.6% | 74.2% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 0.3% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.2% | 0.4% |
| Two or More Races | 0.4% | 2.1% | 3.2% |
| Hispanic | 0.4% | 2.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Barnwell, SC | Albany, GA | United States |
| Married Population | 29.6% | 31.6% | 49.8% |
| Currently Married | 26.3% | 27.5% | 48.0% |
| Married but Separated | 3.3% | 4.2% | 1.8% |
| Single Population | 70.4% | 68.4% | 50.2% |
| Never Married | 49.6% | 46.5% | 33.8% |
| Divorced | 12.0% | 15.0% | 10.8% |
| Widowed | 8.8% | 6.9% | 5.6% |
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| Household Size | 2.40 | 2.35 | 2.60 |
| Households | 1,819 | 28,308 | 124,010,992 |
| Family Households | 968 | 15,782 | 80,755,759 |
| Married couple, w/children | 17.7% | 14.2% | 30.5% |
| Married couple, no children | 25.6% | 30.4% | 42.9% |
| Non Family Households | 851 | 12,526 | 43,255,233 |
| Single householder, w/children | 32.0% | 37.3% | 15.8% |
| Single householder, no children | 24.7% | 18.1% | 10.8% |