| | Demorest, GA | Barnesville, GA | United States |
| Population | 2,479 | 6,335 | 329,725,481 |
| Female Population | 55.1% | 53.5% | 50.5% |
| Male Population | 44.9% | 46.5% | 49.5% |
| Median Age | 24.7 | 28.4 | 38.4 |
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| Population - 2010 | 1,865 | 6,765 | 309,327,143 |
| Population - 2000 | 1,465 | 5,972 | 285,036,114 |
| Population - 1990 | 1,088 | 4,747 | 251,960,433 |
| Pop. 2000 to Now | 46.3% | 11.7% | 15.6% |
| Pop. 1990 to Now | 97.0% | 40.5% | 30.8% |
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| Population Density | 1,105.2 | 1,043.0 | 93.4 |
| Land Area | 2.2 | 6.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Demorest, GA | Barnesville, GA | United States |
| Age 0 to 4 | 7.0% | 2.4% | 5.9% |
| Age 5 to 9 | 2.6% | 4.6% | 6.1% |
| Age 10 to 14 | 2.6% | 5.0% | 6.6% |
| Age 15 to 17 | 5.2% | 7.2% | 3.9% |
| Age 18 to 20 | 24.0% | 18.0% | 4.0% |
| Age 21 to 24 | 10.0% | 7.9% | 5.2% |
| Age 25 to 34 | 5.5% | 13.1% | 13.8% |
| Age 35 to 44 | 8.3% | 9.2% | 12.9% |
| Age 45 to 54 | 8.1% | 12.1% | 12.6% |
| Age 55 to 59 | 3.2% | 1.5% | 6.7% |
| Age 60 to 64 | 6.5% | 4.4% | 6.3% |
| Age 65 to 74 | 9.9% | 8.2% | 9.6% |
| Age 75 to 84 | 4.2% | 4.5% | 4.5% |
| Age 85 and over | 2.8% | 1.8% | 1.9% |
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| Race | | | |
| | Demorest, GA | Barnesville, GA | United States |
| White | 77.0% | 47.8% | 59.4% |
| Black | 6.7% | 46.6% | 12.2% |
| Asian | 2.3% | 0.8% | 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 | 0.7% | 3.6% | 3.2% |
| Hispanic | 13.3% | 1.3% | 18.4% |
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| Marriage & Family | | | |
| | Demorest, GA | Barnesville, GA | United States |
| Married Population | 31.9% | 32.6% | 49.8% |
| Currently Married | 31.3% | 31.2% | 48.0% |
| Married but Separated | 0.6% | 1.3% | 1.8% |
| Single Population | 68.1% | 67.4% | 50.2% |
| Never Married | 49.6% | 51.9% | 33.8% |
| Divorced | 10.8% | 9.3% | 10.8% |
| Widowed | 7.7% | 6.3% | 5.6% |
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| Household Size | 2.73 | 2.19 | 2.60 |
| Households | 690 | 2,304 | 124,010,992 |
| Family Households | 454 | 1,210 | 80,755,759 |
| Married couple, w/children | 21.6% | 28.1% | 30.5% |
| Married couple, no children | 49.3% | 37.8% | 42.9% |
| Non Family Households | 236 | 1,094 | 43,255,233 |
| Single householder, w/children | 17.6% | 24.7% | 15.8% |
| Single householder, no children | 11.5% | 9.4% | 10.8% |