| | Waterloo, SC | Moncks Corner, SC | United States |
| Population | 206 | 12,685 | 329,725,481 |
| Female Population | 54.9% | 52.4% | 50.5% |
| Male Population | 45.2% | 47.6% | 49.5% |
| Median Age | 29.5 | 35.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 170 | 7,756 | 309,327,143 |
| Population - 2000 | 203 | 5,952 | 285,036,114 |
| Population - 1990 | 122 | 5,607 | 251,960,433 |
| Pop. 2000 to Now | -16.3% | 110.0% | 15.6% |
| Pop. 1990 to Now | 39.3% | 122.9% | 30.8% |
| space4 | | | |
| Population Density | 116.1 | 1,651.9 | 93.4 |
| Land Area | 1.8 | 7.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Waterloo, SC | Moncks Corner, SC | United States |
| Age 0 to 4 | 21.4% | 7.2% | 5.9% |
| Age 5 to 9 | 6.3% | 8.0% | 6.1% |
| Age 10 to 14 | 2.9% | 6.0% | 6.6% |
| Age 15 to 17 | 1.5% | 3.7% | 3.9% |
| Age 18 to 20 | 1.5% | 3.8% | 4.0% |
| Age 21 to 24 | 9.2% | 5.4% | 5.2% |
| Age 25 to 34 | 12.1% | 14.5% | 13.8% |
| Age 35 to 44 | 7.8% | 12.7% | 12.9% |
| Age 45 to 54 | 11.2% | 15.4% | 12.6% |
| Age 55 to 59 | 1.0% | 5.4% | 6.7% |
| Age 60 to 64 | 5.3% | 6.7% | 6.3% |
| Age 65 to 74 | 9.7% | 7.5% | 9.6% |
| Age 75 to 84 | 10.2% | 2.0% | 4.5% |
| Age 85 and over | 0.0% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Waterloo, SC | Moncks Corner, SC | United States |
| White | 16.0% | 59.4% | 59.4% |
| Black | 78.6% | 33.6% | 12.2% |
| Asian | 1.5% | 0.3% | 5.6% |
| Native American | 0.0% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.9% | 3.0% | 3.2% |
| Hispanic | 0.0% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Waterloo, SC | Moncks Corner, SC | United States |
| Married Population | 30.8% | 53.4% | 49.8% |
| Currently Married | 28.7% | 50.5% | 48.0% |
| Married but Separated | 2.1% | 3.0% | 1.8% |
| Single Population | 69.2% | 46.6% | 50.2% |
| Never Married | 55.9% | 30.0% | 33.8% |
| Divorced | 9.1% | 12.3% | 10.8% |
| Widowed | 4.2% | 4.3% | 5.6% |
| space5 | | | |
| Household Size | 2.86 | 2.61 | 2.60 |
| Households | 72 | 4,733 | 124,010,992 |
| Family Households | 56 | 3,417 | 80,755,759 |
| Married couple, w/children | 37.5% | 36.0% | 30.5% |
| Married couple, no children | 12.5% | 35.9% | 42.9% |
| Non Family Households | 16 | 1,316 | 43,255,233 |
| Single householder, w/children | 44.6% | 18.6% | 15.8% |
| Single householder, no children | 5.4% | 9.6% | 10.8% |