| | Peninsula, OH | Bratenahl, OH | United States |
| Population | 688 | 1,418 | 329,725,481 |
| Female Population | 48.6% | 56.3% | 50.5% |
| Male Population | 51.5% | 43.7% | 49.5% |
| Median Age | 47.7 | 61.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 553 | 1,198 | 309,327,143 |
| Population - 2000 | 602 | 1,337 | 285,036,114 |
| Population - 1990 | 562 | 1,356 | 251,960,433 |
| Pop. 2000 to Now | -8.8% | -13.8% | 15.6% |
| Pop. 1990 to Now | -2.3% | -15.0% | 30.8% |
| space4 | | | |
| Population Density | 156.1 | 1,387.5 | 93.4 |
| Land Area | 4.4 | 1.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.6 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Peninsula, OH | Bratenahl, OH | United States |
| Age 0 to 4 | 1.3% | 1.8% | 5.9% |
| Age 5 to 9 | 7.6% | 2.5% | 6.1% |
| Age 10 to 14 | 10.8% | 0.9% | 6.6% |
| Age 15 to 17 | 2.0% | 0.4% | 3.9% |
| Age 18 to 20 | 1.3% | 0.6% | 4.0% |
| Age 21 to 24 | 1.7% | 1.5% | 5.2% |
| Age 25 to 34 | 9.7% | 12.3% | 13.8% |
| Age 35 to 44 | 10.3% | 6.3% | 12.9% |
| Age 45 to 54 | 12.4% | 13.9% | 12.6% |
| Age 55 to 59 | 11.8% | 6.6% | 6.7% |
| Age 60 to 64 | 8.9% | 12.1% | 6.3% |
| Age 65 to 74 | 18.9% | 24.3% | 9.6% |
| Age 75 to 84 | 1.7% | 8.8% | 4.5% |
| Age 85 and over | 1.6% | 7.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Peninsula, OH | Bratenahl, OH | United States |
| White | 96.2% | 69.4% | 59.4% |
| Black | 0.7% | 16.3% | 12.2% |
| Asian | 0.3% | 3.2% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.0% | 0.4% |
| Two or More Races | 0.6% | 7.3% | 3.2% |
| Hispanic | 2.2% | 2.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Peninsula, OH | Bratenahl, OH | United States |
| Married Population | 67.1% | 56.0% | 49.8% |
| Currently Married | 65.8% | 55.7% | 48.0% |
| Married but Separated | 1.3% | 0.3% | 1.8% |
| Single Population | 32.9% | 44.0% | 50.2% |
| Never Married | 19.9% | 28.1% | 33.8% |
| Divorced | 8.3% | 10.9% | 10.8% |
| Widowed | 4.7% | 5.0% | 5.6% |
| space5 | | | |
| Household Size | 2.50 | 2.00 | 2.60 |
| Households | 275 | 705 | 124,010,992 |
| Family Households | 208 | 371 | 80,755,759 |
| Married couple, w/children | 27.9% | 10.5% | 30.5% |
| Married couple, no children | 55.8% | 79.8% | 42.9% |
| Non Family Households | 67 | 334 | 43,255,233 |
| Single householder, w/children | 10.6% | 1.1% | 15.8% |
| Single householder, no children | 5.8% | 8.6% | 10.8% |