| | Washington, GA | Harrison, AR | United States |
| Population | 3,786 | 13,081 | 329,725,481 |
| Female Population | 54.3% | 50.9% | 50.5% |
| Male Population | 45.8% | 49.1% | 49.5% |
| Median Age | 43.2 | 38.3 | 38.4 |
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| Population - 2010 | 4,126 | 12,933 | 309,327,143 |
| Population - 2000 | 4,295 | 12,152 | 285,036,114 |
| Population - 1990 | 4,279 | 9,922 | 251,960,433 |
| Pop. 2000 to Now | -9.0% | 8.1% | 15.6% |
| Pop. 1990 to Now | -8.7% | 32.4% | 30.8% |
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| Population Density | 491.8 | 1,167.8 | 93.4 |
| Land Area | 7.7 | 11.2 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Washington, GA | Harrison, AR | United States |
| Age 0 to 4 | 4.7% | 5.9% | 5.9% |
| Age 5 to 9 | 6.3% | 8.3% | 6.1% |
| Age 10 to 14 | 7.2% | 5.5% | 6.6% |
| Age 15 to 17 | 4.8% | 3.6% | 3.9% |
| Age 18 to 20 | 3.0% | 3.1% | 4.0% |
| Age 21 to 24 | 2.8% | 4.3% | 5.2% |
| Age 25 to 34 | 8.5% | 15.5% | 13.8% |
| Age 35 to 44 | 14.0% | 11.3% | 12.9% |
| Age 45 to 54 | 7.7% | 10.4% | 12.6% |
| Age 55 to 59 | 7.1% | 5.9% | 6.7% |
| Age 60 to 64 | 10.8% | 6.5% | 6.3% |
| Age 65 to 74 | 10.1% | 8.9% | 9.6% |
| Age 75 to 84 | 8.8% | 6.1% | 4.5% |
| Age 85 and over | 4.1% | 4.8% | 1.9% |
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| Race | | | |
| | Washington, GA | Harrison, AR | United States |
| White | 38.5% | 92.3% | 59.4% |
| Black | 54.2% | 0.1% | 12.2% |
| Asian | 0.0% | 0.8% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.0% | 2.7% | 3.2% |
| Hispanic | 2.2% | 3.6% | 18.4% |
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| Marriage & Family | | | |
| | Washington, GA | Harrison, AR | United States |
| Married Population | 37.4% | 43.5% | 49.8% |
| Currently Married | 33.9% | 40.9% | 48.0% |
| Married but Separated | 3.5% | 2.6% | 1.8% |
| Single Population | 62.6% | 56.6% | 50.2% |
| Never Married | 40.2% | 27.7% | 33.8% |
| Divorced | 11.3% | 17.5% | 10.8% |
| Widowed | 11.0% | 11.4% | 5.6% |
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| Household Size | 2.25 | 2.23 | 2.60 |
| Households | 1,642 | 5,749 | 124,010,992 |
| Family Households | 860 | 3,174 | 80,755,759 |
| Married couple, w/children | 14.9% | 27.2% | 30.5% |
| Married couple, no children | 40.3% | 38.8% | 42.9% |
| Non Family Households | 782 | 2,575 | 43,255,233 |
| Single householder, w/children | 25.6% | 17.9% | 15.8% |
| Single householder, no children | 19.2% | 16.1% | 10.8% |