| | McCormick, SC | Greer, SC | United States |
| Population | 2,936 | 35,151 | 329,725,481 |
| Female Population | 37.4% | 49.9% | 50.5% |
| Male Population | 62.6% | 50.1% | 49.5% |
| Median Age | 42.4 | 35.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 2,772 | 25,970 | 309,327,143 |
| Population - 2000 | 1,489 | 16,843 | 285,036,114 |
| Population - 1990 | 1,659 | 10,322 | 251,960,433 |
| Pop. 2000 to Now | 55.8% | 109.7% | 15.6% |
| Pop. 1990 to Now | 39.8% | 242.1% | 30.8% |
| space4 | | | |
| Population Density | 724.6 | 1,561.1 | 93.4 |
| Land Area | 4.1 | 22.5 | 3,531,905.4 |
| Water Area | 0.0 | 2.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | McCormick, SC | Greer, SC | United States |
| Age 0 to 4 | 4.8% | 6.8% | 5.9% |
| Age 5 to 9 | 3.7% | 8.1% | 6.1% |
| Age 10 to 14 | 7.7% | 7.4% | 6.6% |
| Age 15 to 17 | 3.0% | 3.9% | 3.9% |
| Age 18 to 20 | 1.4% | 3.0% | 4.0% |
| Age 21 to 24 | 3.4% | 3.9% | 5.2% |
| Age 25 to 34 | 14.1% | 16.2% | 13.8% |
| Age 35 to 44 | 15.1% | 15.3% | 12.9% |
| Age 45 to 54 | 15.3% | 12.9% | 12.6% |
| Age 55 to 59 | 9.1% | 4.1% | 6.7% |
| Age 60 to 64 | 9.4% | 5.0% | 6.3% |
| Age 65 to 74 | 7.3% | 8.4% | 9.6% |
| Age 75 to 84 | 3.5% | 3.4% | 4.5% |
| Age 85 and over | 2.3% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | McCormick, SC | Greer, SC | United States |
| White | 28.6% | 59.6% | 59.4% |
| Black | 66.6% | 16.2% | 12.2% |
| Asian | 0.1% | 5.6% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.9% | 2.3% | 3.2% |
| Hispanic | 0.8% | 16.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | McCormick, SC | Greer, SC | United States |
| Married Population | 30.3% | 53.2% | 49.8% |
| Currently Married | 26.9% | 50.7% | 48.0% |
| Married but Separated | 3.4% | 2.6% | 1.8% |
| Single Population | 69.7% | 46.8% | 50.2% |
| Never Married | 46.4% | 30.3% | 33.8% |
| Divorced | 12.4% | 11.5% | 10.8% |
| Widowed | 10.9% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.54 | 2.63 | 2.60 |
| Households | 783 | 13,294 | 124,010,992 |
| Family Households | 459 | 8,847 | 80,755,759 |
| Married couple, w/children | 11.1% | 40.3% | 30.5% |
| Married couple, no children | 37.3% | 32.9% | 42.9% |
| Non Family Households | 324 | 4,447 | 43,255,233 |
| Single householder, w/children | 39.2% | 17.8% | 15.8% |
| Single householder, no children | 12.4% | 9.0% | 10.8% |