| | Orrstown, PA | Amsterdam, OH | United States |
| Population | 356 | 468 | 329,725,481 |
| Female Population | 53.9% | 53.4% | 50.5% |
| Male Population | 46.1% | 46.6% | 49.5% |
| Median Age | 45.5 | 31.9 | 38.4 |
| space3 | | | |
| Population - 2010 | 262 | 511 | 309,327,143 |
| Population - 2000 | 231 | 568 | 285,036,114 |
| Population - 1990 | 220 | 669 | 251,960,433 |
| Pop. 2000 to Now | 11.7% | -17.4% | 15.6% |
| Pop. 1990 to Now | 17.3% | -29.9% | 30.8% |
| space4 | | | |
| Population Density | 5,562.5 | 1,462.5 | 93.4 |
| Land Area | 0.1 | 0.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Orrstown, PA | Amsterdam, OH | United States |
| Age 0 to 4 | 6.5% | 6.8% | 5.9% |
| Age 5 to 9 | 7.6% | 6.8% | 6.1% |
| Age 10 to 14 | 6.7% | 8.5% | 6.6% |
| Age 15 to 17 | 4.2% | 2.1% | 3.9% |
| Age 18 to 20 | 0.6% | 4.9% | 4.0% |
| Age 21 to 24 | 1.7% | 3.6% | 5.2% |
| Age 25 to 34 | 11.0% | 22.7% | 13.8% |
| Age 35 to 44 | 11.5% | 8.3% | 12.9% |
| Age 45 to 54 | 2.8% | 16.7% | 12.6% |
| Age 55 to 59 | 7.9% | 6.8% | 6.7% |
| Age 60 to 64 | 16.9% | 2.6% | 6.3% |
| Age 65 to 74 | 8.4% | 4.9% | 9.6% |
| Age 75 to 84 | 7.3% | 4.1% | 4.5% |
| Age 85 and over | 7.0% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Orrstown, PA | Amsterdam, OH | United States |
| White | 99.4% | 93.8% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 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 | 0.0% | 1.9% | 3.2% |
| Hispanic | 0.6% | 4.3% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Orrstown, PA | Amsterdam, OH | United States |
| Married Population | 47.2% | 51.6% | 49.8% |
| Currently Married | 46.8% | 51.6% | 48.0% |
| Married but Separated | 0.4% | 0.0% | 1.8% |
| Single Population | 52.8% | 48.4% | 50.2% |
| Never Married | 23.8% | 33.5% | 33.8% |
| Divorced | 10.3% | 9.6% | 10.8% |
| Widowed | 18.8% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.31 | 2.91 | 2.60 |
| Households | 144 | 161 | 124,010,992 |
| Family Households | 82 | 119 | 80,755,759 |
| Married couple, w/children | 32.9% | 26.9% | 30.5% |
| Married couple, no children | 52.4% | 53.8% | 42.9% |
| Non Family Households | 62 | 42 | 43,255,233 |
| Single householder, w/children | 14.6% | 11.8% | 15.8% |
| Single householder, no children | 0.0% | 7.6% | 10.8% |