| | Palmyra, PA | East Petersburg, PA | United States |
| Population | 7,750 | 4,581 | 329,725,481 |
| Female Population | 54.9% | 50.0% | 50.5% |
| Male Population | 45.1% | 50.0% | 49.5% |
| Median Age | 34.2 | 44.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 7,325 | 4,508 | 309,327,143 |
| Population - 2000 | 7,096 | 4,450 | 285,036,114 |
| Population - 1990 | 6,910 | 4,197 | 251,960,433 |
| Pop. 2000 to Now | 6.1% | 0.8% | 15.6% |
| Pop. 1990 to Now | 8.9% | 6.9% | 30.8% |
| space4 | | | |
| Population Density | 4,030.2 | 3,792.2 | 93.4 |
| Land Area | 1.9 | 1.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Palmyra, PA | East Petersburg, PA | United States |
| Age 0 to 4 | 8.4% | 3.1% | 5.9% |
| Age 5 to 9 | 10.3% | 9.8% | 6.1% |
| Age 10 to 14 | 6.2% | 5.0% | 6.6% |
| Age 15 to 17 | 2.1% | 3.9% | 3.9% |
| Age 18 to 20 | 2.3% | 0.8% | 4.0% |
| Age 21 to 24 | 8.5% | 1.8% | 5.2% |
| Age 25 to 34 | 12.9% | 11.4% | 13.8% |
| Age 35 to 44 | 10.8% | 14.8% | 12.9% |
| Age 45 to 54 | 13.3% | 15.7% | 12.6% |
| Age 55 to 59 | 5.9% | 6.9% | 6.7% |
| Age 60 to 64 | 3.8% | 6.5% | 6.3% |
| Age 65 to 74 | 10.3% | 11.6% | 9.6% |
| Age 75 to 84 | 3.5% | 5.7% | 4.5% |
| Age 85 and over | 1.7% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Palmyra, PA | East Petersburg, PA | United States |
| White | 77.0% | 73.6% | 59.4% |
| Black | 3.4% | 5.2% | 12.2% |
| Asian | 3.0% | 1.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.0% | 0.4% |
| Two or More Races | 4.4% | 6.5% | 3.2% |
| Hispanic | 12.1% | 13.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Palmyra, PA | East Petersburg, PA | United States |
| Married Population | 39.8% | 68.4% | 49.8% |
| Currently Married | 38.1% | 68.4% | 48.0% |
| Married but Separated | 1.7% | 0.0% | 1.8% |
| Single Population | 60.2% | 31.6% | 50.2% |
| Never Married | 38.6% | 16.7% | 33.8% |
| Divorced | 14.8% | 9.4% | 10.8% |
| Widowed | 6.8% | 5.5% | 5.6% |
| space5 | | | |
| Household Size | 2.48 | 2.40 | 2.60 |
| Households | 3,112 | 1,907 | 124,010,992 |
| Family Households | 1,773 | 1,456 | 80,755,759 |
| Married couple, w/children | 25.8% | 39.8% | 30.5% |
| Married couple, no children | 33.8% | 48.4% | 42.9% |
| Non Family Households | 1,339 | 451 | 43,255,233 |
| Single householder, w/children | 27.3% | 5.5% | 15.8% |
| Single householder, no children | 13.0% | 6.3% | 10.8% |