| | Cornwall, PA | Hershey, PA | United States |
| Population | 4,563 | 14,619 | 329,725,481 |
| Female Population | 47.4% | 52.5% | 50.5% |
| Male Population | 52.6% | 47.5% | 49.5% |
| Median Age | 52.9 | 46.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,118 | 13,082 | 309,327,143 |
| Population - 2000 | 3,486 | 12,771 | 285,036,114 |
| Population - 1990 | 3,231 | 11,860 | 251,960,433 |
| Pop. 2000 to Now | 25.7% | 18.7% | 15.6% |
| Pop. 1990 to Now | 35.6% | 27.8% | 30.8% |
| space4 | | | |
| Population Density | 470.3 | 1,020.7 | 93.4 |
| Land Area | 9.7 | 14.3 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Cornwall, PA | Hershey, PA | United States |
| Age 0 to 4 | 6.4% | 3.7% | 5.9% |
| Age 5 to 9 | 3.9% | 3.8% | 6.1% |
| Age 10 to 14 | 4.5% | 6.2% | 6.6% |
| Age 15 to 17 | 1.2% | 6.1% | 3.9% |
| Age 18 to 20 | 0.9% | 3.0% | 4.0% |
| Age 21 to 24 | 2.4% | 5.9% | 5.2% |
| Age 25 to 34 | 13.2% | 10.6% | 13.8% |
| Age 35 to 44 | 7.9% | 9.0% | 12.9% |
| Age 45 to 54 | 11.9% | 17.0% | 12.6% |
| Age 55 to 59 | 8.2% | 5.0% | 6.7% |
| Age 60 to 64 | 9.4% | 10.3% | 6.3% |
| Age 65 to 74 | 12.3% | 9.7% | 9.6% |
| Age 75 to 84 | 8.5% | 6.1% | 4.5% |
| Age 85 and over | 9.4% | 3.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Cornwall, PA | Hershey, PA | United States |
| White | 91.5% | 74.6% | 59.4% |
| Black | 1.8% | 2.7% | 12.2% |
| Asian | 1.0% | 5.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.4% | 2.9% | 0.4% |
| Two or More Races | 0.3% | 2.4% | 3.2% |
| Hispanic | 4.0% | 12.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Cornwall, PA | Hershey, PA | United States |
| Married Population | 71.3% | 51.7% | 49.8% |
| Currently Married | 70.4% | 50.0% | 48.0% |
| Married but Separated | 0.9% | 1.7% | 1.8% |
| Single Population | 28.7% | 48.3% | 50.2% |
| Never Married | 12.5% | 35.4% | 33.8% |
| Divorced | 9.1% | 6.8% | 10.8% |
| Widowed | 7.0% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.32 | 2.60 |
| Households | 1,954 | 5,455 | 124,010,992 |
| Family Households | 1,474 | 3,353 | 80,755,759 |
| Married couple, w/children | 24.0% | 30.6% | 30.5% |
| Married couple, no children | 65.2% | 47.5% | 42.9% |
| Non Family Households | 480 | 2,102 | 43,255,233 |
| Single householder, w/children | 3.7% | 14.9% | 15.8% |
| Single householder, no children | 7.1% | 7.1% | 10.8% |