| | Snow Hill, MD | Union, SC | United States |
| Population | 2,442 | 8,119 | 329,725,481 |
| Female Population | 47.5% | 54.7% | 50.5% |
| Male Population | 52.5% | 45.3% | 49.5% |
| Median Age | 37.5 | 46.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,120 | 8,352 | 309,327,143 |
| Population - 2000 | 2,409 | 8,793 | 285,036,114 |
| Population - 1990 | 2,217 | 9,836 | 251,960,433 |
| Pop. 2000 to Now | -15.1% | -14.3% | 15.6% |
| Pop. 1990 to Now | -7.7% | -23.4% | 30.8% |
| space4 | | | |
| Population Density | 805.7 | 1,017.2 | 93.4 |
| Land Area | 3.0 | 8.0 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Snow Hill, MD | Union, SC | United States |
| Age 0 to 4 | 4.1% | 5.8% | 5.9% |
| Age 5 to 9 | 9.8% | 5.3% | 6.1% |
| Age 10 to 14 | 4.6% | 4.2% | 6.6% |
| Age 15 to 17 | 6.3% | 2.5% | 3.9% |
| Age 18 to 20 | 4.2% | 4.1% | 4.0% |
| Age 21 to 24 | 7.2% | 4.1% | 5.2% |
| Age 25 to 34 | 11.2% | 11.0% | 13.8% |
| Age 35 to 44 | 15.0% | 10.0% | 12.9% |
| Age 45 to 54 | 8.3% | 15.4% | 12.6% |
| Age 55 to 59 | 4.8% | 8.1% | 6.7% |
| Age 60 to 64 | 7.9% | 8.0% | 6.3% |
| Age 65 to 74 | 7.7% | 13.2% | 9.6% |
| Age 75 to 84 | 5.4% | 5.1% | 4.5% |
| Age 85 and over | 3.4% | 3.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Snow Hill, MD | Union, SC | United States |
| White | 56.3% | 49.1% | 59.4% |
| Black | 31.9% | 45.7% | 12.2% |
| Asian | 4.4% | 0.0% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 3.3% | 1.9% | 3.2% |
| Hispanic | 4.0% | 3.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Snow Hill, MD | Union, SC | United States |
| Married Population | 28.9% | 40.3% | 49.8% |
| Currently Married | 27.1% | 37.2% | 48.0% |
| Married but Separated | 1.8% | 3.2% | 1.8% |
| Single Population | 71.1% | 59.7% | 50.2% |
| Never Married | 53.3% | 36.2% | 33.8% |
| Divorced | 8.8% | 13.5% | 10.8% |
| Widowed | 9.0% | 10.0% | 5.6% |
| space5 | | | |
| Household Size | 2.68 | 2.15 | 2.60 |
| Households | 882 | 3,716 | 124,010,992 |
| Family Households | 544 | 2,019 | 80,755,759 |
| Married couple, w/children | 12.5% | 18.3% | 30.5% |
| Married couple, no children | 36.0% | 41.9% | 42.9% |
| Non Family Households | 338 | 1,697 | 43,255,233 |
| Single householder, w/children | 41.0% | 23.9% | 15.8% |
| Single householder, no children | 10.5% | 16.0% | 10.8% |