| | Cottageville, SC | Mechanicsburg, PA | United States |
| Population | 1,155 | 9,310 | 329,725,481 |
| Female Population | 55.3% | 48.5% | 50.5% |
| Male Population | 44.7% | 51.5% | 49.5% |
| Median Age | 38.4 | 38.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 768 | 8,937 | 309,327,143 |
| Population - 2000 | 707 | 9,042 | 285,036,114 |
| Population - 1990 | 572 | 9,452 | 251,960,433 |
| Pop. 2000 to Now | 5.7% | -0.3% | 15.6% |
| Pop. 1990 to Now | 30.6% | -4.6% | 30.8% |
| space4 | | | |
| Population Density | 338.1 | 3,863.1 | 93.4 |
| Land Area | 3.4 | 2.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Cottageville, SC | Mechanicsburg, PA | United States |
| Age 0 to 4 | 5.4% | 4.3% | 5.9% |
| Age 5 to 9 | 8.6% | 7.4% | 6.1% |
| Age 10 to 14 | 5.7% | 6.9% | 6.6% |
| Age 15 to 17 | 2.0% | 1.8% | 3.9% |
| Age 18 to 20 | 3.6% | 1.4% | 4.0% |
| Age 21 to 24 | 3.6% | 5.1% | 5.2% |
| Age 25 to 34 | 12.0% | 17.6% | 13.8% |
| Age 35 to 44 | 18.3% | 13.9% | 12.9% |
| Age 45 to 54 | 12.3% | 10.4% | 12.6% |
| Age 55 to 59 | 8.1% | 9.8% | 6.7% |
| Age 60 to 64 | 7.3% | 5.0% | 6.3% |
| Age 65 to 74 | 8.7% | 8.6% | 9.6% |
| Age 75 to 84 | 2.8% | 6.0% | 4.5% |
| Age 85 and over | 1.6% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Cottageville, SC | Mechanicsburg, PA | United States |
| White | 90.5% | 84.7% | 59.4% |
| Black | 6.0% | 2.1% | 12.2% |
| Asian | 0.0% | 1.6% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.9% | 4.4% | 3.2% |
| Hispanic | 0.6% | 7.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Cottageville, SC | Mechanicsburg, PA | United States |
| Married Population | 61.3% | 50.1% | 49.8% |
| Currently Married | 57.1% | 47.3% | 48.0% |
| Married but Separated | 4.2% | 2.8% | 1.8% |
| Single Population | 38.7% | 49.9% | 50.2% |
| Never Married | 18.4% | 31.2% | 33.8% |
| Divorced | 14.1% | 12.2% | 10.8% |
| Widowed | 6.1% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.95 | 2.29 | 2.60 |
| Households | 392 | 4,037 | 124,010,992 |
| Family Households | 283 | 2,496 | 80,755,759 |
| Married couple, w/children | 32.2% | 25.3% | 30.5% |
| Married couple, no children | 44.5% | 45.7% | 42.9% |
| Non Family Households | 109 | 1,541 | 43,255,233 |
| Single householder, w/children | 7.8% | 15.4% | 15.8% |
| Single householder, no children | 15.5% | 13.6% | 10.8% |