| | Hartford, SD | Brevard, NC | United States |
| Population | 3,263 | 7,712 | 329,725,481 |
| Female Population | 49.8% | 55.0% | 50.5% |
| Male Population | 50.2% | 45.0% | 49.5% |
| Median Age | 38.7 | 47.2 | 38.4 |
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| Population - 2010 | 2,543 | 7,671 | 309,327,143 |
| Population - 2000 | 1,844 | 6,789 | 285,036,114 |
| Population - 1990 | 1,262 | 5,388 | 251,960,433 |
| Pop. 2000 to Now | 84.7% | 16.4% | 15.6% |
| Pop. 1990 to Now | 169.9% | 46.6% | 30.8% |
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| Population Density | 1,228.5 | 1,445.6 | 93.4 |
| Land Area | 2.7 | 5.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Hartford, SD | Brevard, NC | United States |
| Age 0 to 4 | 5.8% | 4.3% | 5.9% |
| Age 5 to 9 | 8.4% | 4.3% | 6.1% |
| Age 10 to 14 | 8.3% | 2.2% | 6.6% |
| Age 15 to 17 | 2.9% | 4.1% | 3.9% |
| Age 18 to 20 | 1.5% | 6.3% | 4.0% |
| Age 21 to 24 | 2.6% | 6.4% | 5.2% |
| Age 25 to 34 | 14.9% | 12.7% | 13.8% |
| Age 35 to 44 | 13.5% | 6.9% | 12.9% |
| Age 45 to 54 | 11.5% | 9.2% | 12.6% |
| Age 55 to 59 | 5.9% | 4.9% | 6.7% |
| Age 60 to 64 | 6.1% | 8.4% | 6.3% |
| Age 65 to 74 | 11.7% | 15.0% | 9.6% |
| Age 75 to 84 | 5.8% | 9.7% | 4.5% |
| Age 85 and over | 1.1% | 5.6% | 1.9% |
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| Race | | | |
| | Hartford, SD | Brevard, NC | United States |
| White | 86.6% | 81.2% | 59.4% |
| Black | 0.6% | 12.5% | 12.2% |
| Asian | 0.2% | 0.0% | 5.6% |
| Native American | 0.6% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 8.9% | 3.6% | 3.2% |
| Hispanic | 3.1% | 2.2% | 18.4% |
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| Marriage & Family | | | |
| | Hartford, SD | Brevard, NC | United States |
| Married Population | 65.5% | 47.0% | 49.8% |
| Currently Married | 64.3% | 44.4% | 48.0% |
| Married but Separated | 1.2% | 2.5% | 1.8% |
| Single Population | 34.5% | 53.0% | 50.2% |
| Never Married | 17.3% | 33.9% | 33.8% |
| Divorced | 10.9% | 8.1% | 10.8% |
| Widowed | 6.3% | 11.0% | 5.6% |
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| Household Size | 2.52 | 2.01 | 2.60 |
| Households | 1,297 | 3,396 | 124,010,992 |
| Family Households | 984 | 1,978 | 80,755,759 |
| Married couple, w/children | 32.5% | 14.3% | 30.5% |
| Married couple, no children | 48.2% | 55.6% | 42.9% |
| Non Family Households | 313 | 1,418 | 43,255,233 |
| Single householder, w/children | 15.5% | 20.7% | 15.8% |
| Single householder, no children | 3.8% | 9.5% | 10.8% |