| | Peninsula, OH | Prospect, PA | United States |
| Population | 688 | 1,001 | 329,725,481 |
| Female Population | 48.6% | 54.8% | 50.5% |
| Male Population | 51.5% | 45.3% | 49.5% |
| Median Age | 47.7 | 49.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 553 | 1,171 | 309,327,143 |
| Population - 2000 | 602 | 1,234 | 285,036,114 |
| Population - 1990 | 562 | 1,122 | 251,960,433 |
| Pop. 2000 to Now | -8.8% | -9.9% | 15.6% |
| Pop. 1990 to Now | -2.3% | -0.9% | 30.8% |
| space4 | | | |
| Population Density | 156.1 | 245.2 | 93.4 |
| Land Area | 4.4 | 4.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Peninsula, OH | Prospect, PA | United States |
| Age 0 to 4 | 1.3% | 3.6% | 5.9% |
| Age 5 to 9 | 7.6% | 2.8% | 6.1% |
| Age 10 to 14 | 10.8% | 5.4% | 6.6% |
| Age 15 to 17 | 2.0% | 3.0% | 3.9% |
| Age 18 to 20 | 1.3% | 3.9% | 4.0% |
| Age 21 to 24 | 1.7% | 6.8% | 5.2% |
| Age 25 to 34 | 9.7% | 7.4% | 13.8% |
| Age 35 to 44 | 10.3% | 10.6% | 12.9% |
| Age 45 to 54 | 12.4% | 17.9% | 12.6% |
| Age 55 to 59 | 11.8% | 9.9% | 6.7% |
| Age 60 to 64 | 8.9% | 10.3% | 6.3% |
| Age 65 to 74 | 18.9% | 13.4% | 9.6% |
| Age 75 to 84 | 1.7% | 3.0% | 4.5% |
| Age 85 and over | 1.6% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Peninsula, OH | Prospect, PA | United States |
| White | 96.2% | 94.1% | 59.4% |
| Black | 0.7% | 0.0% | 12.2% |
| Asian | 0.3% | 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 | 0.6% | 3.0% | 3.2% |
| Hispanic | 2.2% | 2.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Peninsula, OH | Prospect, PA | United States |
| Married Population | 67.1% | 56.6% | 49.8% |
| Currently Married | 65.8% | 55.9% | 48.0% |
| Married but Separated | 1.3% | 0.7% | 1.8% |
| Single Population | 32.9% | 43.4% | 50.2% |
| Never Married | 19.9% | 24.6% | 33.8% |
| Divorced | 8.3% | 13.9% | 10.8% |
| Widowed | 4.7% | 4.9% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.52 | 2.60 |
| Households | 275 | 397 | 124,010,992 |
| Family Households | 208 | 279 | 80,755,759 |
| Married couple, w/children | 27.9% | 27.2% | 30.5% |
| Married couple, no children | 55.8% | 59.1% | 42.9% |
| Non Family Households | 67 | 118 | 43,255,233 |
| Single householder, w/children | 10.6% | 4.3% | 15.8% |
| Single householder, no children | 5.8% | 9.3% | 10.8% |