| | Apollo, PA | Carrolltown, PA | United States |
| Population | 1,300 | 817 | 329,725,481 |
| Female Population | 46.5% | 47.5% | 50.5% |
| Male Population | 53.5% | 52.5% | 49.5% |
| Median Age | 44.5 | 42.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,644 | 852 | 309,327,143 |
| Population - 2000 | 1,765 | 1,049 | 285,036,114 |
| Population - 1990 | 1,895 | 1,286 | 251,960,433 |
| Pop. 2000 to Now | -14.6% | -25.6% | 15.6% |
| Pop. 1990 to Now | -20.5% | -39.4% | 30.8% |
| space4 | | | |
| Population Density | 4,262.3 | 1,180.6 | 93.4 |
| Land Area | 0.3 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Apollo, PA | Carrolltown, PA | United States |
| Age 0 to 4 | 4.8% | 3.7% | 5.9% |
| Age 5 to 9 | 5.1% | 8.1% | 6.1% |
| Age 10 to 14 | 4.9% | 3.6% | 6.6% |
| Age 15 to 17 | 3.6% | 2.8% | 3.9% |
| Age 18 to 20 | 3.1% | 4.2% | 4.0% |
| Age 21 to 24 | 10.8% | 10.4% | 5.2% |
| Age 25 to 34 | 9.6% | 10.4% | 13.8% |
| Age 35 to 44 | 8.8% | 8.9% | 12.9% |
| Age 45 to 54 | 19.2% | 12.1% | 12.6% |
| Age 55 to 59 | 7.9% | 10.0% | 6.7% |
| Age 60 to 64 | 6.2% | 8.4% | 6.3% |
| Age 65 to 74 | 7.2% | 11.1% | 9.6% |
| Age 75 to 84 | 5.6% | 3.7% | 4.5% |
| Age 85 and over | 3.2% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Apollo, PA | Carrolltown, PA | United States |
| White | 84.6% | 99.4% | 59.4% |
| Black | 3.7% | 0.0% | 12.2% |
| Asian | 2.2% | 0.0% | 5.6% |
| Native American | 0.3% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.5% | 0.1% | 3.2% |
| Hispanic | 5.7% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Apollo, PA | Carrolltown, PA | United States |
| Married Population | 37.0% | 47.5% | 49.8% |
| Currently Married | 35.1% | 45.8% | 48.0% |
| Married but Separated | 1.9% | 1.7% | 1.8% |
| Single Population | 63.0% | 52.5% | 50.2% |
| Never Married | 39.6% | 30.9% | 33.8% |
| Divorced | 12.6% | 14.9% | 10.8% |
| Widowed | 10.8% | 6.6% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.38 | 2.60 |
| Households | 563 | 344 | 124,010,992 |
| Family Households | 293 | 206 | 80,755,759 |
| Married couple, w/children | 25.9% | 26.2% | 30.5% |
| Married couple, no children | 34.5% | 48.1% | 42.9% |
| Non Family Households | 270 | 138 | 43,255,233 |
| Single householder, w/children | 8.5% | 9.2% | 15.8% |
| Single householder, no children | 31.1% | 16.5% | 10.8% |