| | Eastham, MA | Pepperell, MA | United States |
| Population | 5,674 | 11,671 | 329,725,481 |
| Female Population | 55.0% | 50.9% | 50.5% |
| Male Population | 45.0% | 49.1% | 49.5% |
| Median Age | 59 | 42.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,956 | 11,542 | 309,327,143 |
| Population - 2000 | 5,453 | 11,142 | 285,036,114 |
| Population - 1990 | 4,462 | 10,098 | 251,960,433 |
| Pop. 2000 to Now | -10.1% | 8.1% | 15.6% |
| Pop. 1990 to Now | 9.9% | 19.3% | 30.8% |
| space4 | | | |
| Population Density | 406.5 | 516.4 | 93.4 |
| Land Area | 14.0 | 22.6 | 3,531,905.4 |
| Water Area | 11.7 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Eastham, MA | Pepperell, MA | United States |
| Age 0 to 4 | 2.7% | 6.6% | 5.9% |
| Age 5 to 9 | 3.8% | 5.0% | 6.1% |
| Age 10 to 14 | 4.3% | 5.8% | 6.6% |
| Age 15 to 17 | 3.6% | 4.1% | 3.9% |
| Age 18 to 20 | 1.5% | 3.5% | 4.0% |
| Age 21 to 24 | 2.0% | 3.2% | 5.2% |
| Age 25 to 34 | 6.5% | 12.5% | 13.8% |
| Age 35 to 44 | 6.5% | 11.3% | 12.9% |
| Age 45 to 54 | 11.6% | 15.8% | 12.6% |
| Age 55 to 59 | 8.7% | 7.8% | 6.7% |
| Age 60 to 64 | 10.0% | 8.3% | 6.3% |
| Age 65 to 74 | 22.3% | 11.8% | 9.6% |
| Age 75 to 84 | 9.9% | 2.8% | 4.5% |
| Age 85 and over | 6.6% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Eastham, MA | Pepperell, MA | United States |
| White | 89.8% | 88.1% | 59.4% |
| Black | 2.8% | 1.1% | 12.2% |
| Asian | 2.9% | 4.7% | 5.6% |
| Native American | 0.4% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 3.9% | 2.8% | 3.2% |
| Hispanic | 0.1% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Eastham, MA | Pepperell, MA | United States |
| Married Population | 59.4% | 56.4% | 49.8% |
| Currently Married | 59.0% | 55.8% | 48.0% |
| Married but Separated | 0.4% | 0.6% | 1.8% |
| Single Population | 40.6% | 43.6% | 50.2% |
| Never Married | 23.3% | 29.2% | 33.8% |
| Divorced | 10.0% | 9.6% | 10.8% |
| Widowed | 7.3% | 4.8% | 5.6% |
| space5 | | | |
| Household Size | 2.25 | 2.66 | 2.60 |
| Households | 2,525 | 4,361 | 124,010,992 |
| Family Households | 1,749 | 3,130 | 80,755,759 |
| Married couple, w/children | 16.8% | 33.5% | 30.5% |
| Married couple, no children | 64.8% | 48.7% | 42.9% |
| Non Family Households | 776 | 1,231 | 43,255,233 |
| Single householder, w/children | 10.0% | 8.6% | 15.8% |
| Single householder, no children | 8.3% | 9.2% | 10.8% |