| | St. Bernard, OH | Turpin Hills, OH | United States |
| Population | 4,052 | 5,710 | 329,725,481 |
| Female Population | 51.6% | 44.6% | 50.5% |
| Male Population | 48.5% | 55.4% | 49.5% |
| Median Age | 46.7 | 39.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,372 | 4,930 | 309,327,143 |
| Population - 2000 | 4,924 | 4,960 | 285,036,114 |
| Population - 1990 | 5,344 | 4,927 | 251,960,433 |
| Pop. 2000 to Now | -12.3% | 5.3% | 15.6% |
| Pop. 1990 to Now | -19.2% | 6.0% | 30.8% |
| space4 | | | |
| Population Density | 2,621.0 | 1,917.4 | 93.4 |
| Land Area | 1.5 | 3.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | St. Bernard, OH | Turpin Hills, OH | United States |
| Age 0 to 4 | 2.3% | 7.1% | 5.9% |
| Age 5 to 9 | 6.0% | 3.6% | 6.1% |
| Age 10 to 14 | 5.3% | 14.1% | 6.6% |
| Age 15 to 17 | 2.2% | 8.4% | 3.9% |
| Age 18 to 20 | 3.9% | 5.0% | 4.0% |
| Age 21 to 24 | 3.9% | 3.1% | 5.2% |
| Age 25 to 34 | 11.3% | 3.5% | 13.8% |
| Age 35 to 44 | 9.7% | 15.3% | 12.9% |
| Age 45 to 54 | 20.8% | 18.3% | 12.6% |
| Age 55 to 59 | 10.1% | 5.6% | 6.7% |
| Age 60 to 64 | 9.1% | 5.9% | 6.3% |
| Age 65 to 74 | 10.8% | 6.5% | 9.6% |
| Age 75 to 84 | 2.6% | 3.6% | 4.5% |
| Age 85 and over | 2.2% | 0.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | St. Bernard, OH | Turpin Hills, OH | United States |
| White | 86.1% | 90.1% | 59.4% |
| Black | 10.6% | 4.1% | 12.2% |
| Asian | 0.0% | 0.7% | 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 | 0.8% | 1.3% | 3.2% |
| Hispanic | 2.5% | 3.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | St. Bernard, OH | Turpin Hills, OH | United States |
| Married Population | 58.0% | 66.5% | 49.8% |
| Currently Married | 57.3% | 65.8% | 48.0% |
| Married but Separated | 0.7% | 0.7% | 1.8% |
| Single Population | 42.0% | 33.5% | 50.2% |
| Never Married | 25.3% | 26.6% | 33.8% |
| Divorced | 9.3% | 5.0% | 10.8% |
| Widowed | 7.4% | 1.9% | 5.6% |
| space5 | | | |
| Household Size | 2.31 | 3.09 | 2.60 |
| Households | 1,747 | 1,847 | 124,010,992 |
| Family Households | 1,086 | 1,535 | 80,755,759 |
| Married couple, w/children | 22.2% | 59.2% | 30.5% |
| Married couple, no children | 54.8% | 32.6% | 42.9% |
| Non Family Households | 661 | 312 | 43,255,233 |
| Single householder, w/children | 10.2% | 5.2% | 15.8% |
| Single householder, no children | 12.8% | 3.0% | 10.8% |