| | Warrenton, NC | Greenfield, NH | United States |
| Population | 906 | 1,789 | 329,725,481 |
| Female Population | 50.8% | 51.1% | 50.5% |
| Male Population | 49.2% | 48.9% | 49.5% |
| Median Age | 56.1 | 49.4 | 38.4 |
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| Population - 2010 | 896 | 1,747 | 309,327,143 |
| Population - 2000 | 811 | 1,657 | 285,036,114 |
| Population - 1990 | 949 | 1,519 | 251,960,433 |
| Pop. 2000 to Now | 1.2% | 11.4% | 15.6% |
| Pop. 1990 to Now | -13.5% | 21.5% | 30.8% |
| space4 | | | |
| Population Density | 842.0 | 68.5 | 93.4 |
| Land Area | 1.1 | 26.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Warrenton, NC | Greenfield, NH | United States |
| Age 0 to 4 | 3.9% | 5.0% | 5.9% |
| Age 5 to 9 | 5.1% | 4.2% | 6.1% |
| Age 10 to 14 | 3.1% | 5.5% | 6.6% |
| Age 15 to 17 | 1.2% | 3.8% | 3.9% |
| Age 18 to 20 | 0.6% | 3.0% | 4.0% |
| Age 21 to 24 | 1.2% | 3.7% | 5.2% |
| Age 25 to 34 | 11.6% | 9.6% | 13.8% |
| Age 35 to 44 | 7.7% | 11.4% | 12.9% |
| Age 45 to 54 | 15.5% | 12.1% | 12.6% |
| Age 55 to 59 | 7.8% | 15.0% | 6.7% |
| Age 60 to 64 | 10.3% | 9.1% | 6.3% |
| Age 65 to 74 | 20.8% | 11.8% | 9.6% |
| Age 75 to 84 | 9.2% | 4.2% | 4.5% |
| Age 85 and over | 2.2% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Warrenton, NC | Greenfield, NH | United States |
| White | 46.9% | 97.8% | 59.4% |
| Black | 42.3% | 0.3% | 12.2% |
| Asian | 0.1% | 0.4% | 5.6% |
| Native American | 1.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 1.3% | 3.2% |
| Hispanic | 8.1% | 0.1% | 18.4% |
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| Marriage & Family | | | |
| | Warrenton, NC | Greenfield, NH | United States |
| Married Population | 34.8% | 57.7% | 49.8% |
| Currently Married | 31.0% | 57.0% | 48.0% |
| Married but Separated | 3.8% | 0.7% | 1.8% |
| Single Population | 65.2% | 42.3% | 50.2% |
| Never Married | 24.6% | 24.1% | 33.8% |
| Divorced | 25.6% | 13.5% | 10.8% |
| Widowed | 15.1% | 4.8% | 5.6% |
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| Household Size | 1.81 | 2.56 | 2.60 |
| Households | 500 | 677 | 124,010,992 |
| Family Households | 210 | 503 | 80,755,759 |
| Married couple, w/children | 12.4% | 26.4% | 30.5% |
| Married couple, no children | 39.0% | 55.9% | 42.9% |
| Non Family Households | 290 | 174 | 43,255,233 |
| Single householder, w/children | 16.7% | 9.9% | 15.8% |
| Single householder, no children | 31.9% | 7.8% | 10.8% |