| | Parma Heights, OH | Strongsville, OH | United States |
| Population | 20,764 | 46,187 | 329,725,481 |
| Female Population | 51.2% | 50.0% | 50.5% |
| Male Population | 48.8% | 50.0% | 49.5% |
| Median Age | 40.7 | 46.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 20,685 | 44,714 | 309,327,143 |
| Population - 2000 | 21,659 | 43,858 | 285,036,114 |
| Population - 1990 | 21,448 | 35,308 | 251,960,433 |
| Pop. 2000 to Now | -9.3% | 1.4% | 15.6% |
| Pop. 1990 to Now | -8.4% | 26.0% | 30.8% |
| space4 | | | |
| Population Density | 4,954.4 | 1,875.8 | 93.4 |
| Land Area | 4.2 | 24.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Parma Heights, OH | Strongsville, OH | United States |
| Age 0 to 4 | 6.5% | 5.5% | 5.9% |
| Age 5 to 9 | 4.7% | 5.1% | 6.1% |
| Age 10 to 14 | 5.6% | 6.0% | 6.6% |
| Age 15 to 17 | 3.7% | 3.8% | 3.9% |
| Age 18 to 20 | 2.9% | 2.9% | 4.0% |
| Age 21 to 24 | 4.5% | 3.4% | 5.2% |
| Age 25 to 34 | 14.4% | 9.6% | 13.8% |
| Age 35 to 44 | 12.5% | 11.8% | 12.9% |
| Age 45 to 54 | 11.9% | 13.3% | 12.6% |
| Age 55 to 59 | 6.4% | 8.2% | 6.7% |
| Age 60 to 64 | 7.0% | 8.4% | 6.3% |
| Age 65 to 74 | 11.5% | 12.2% | 9.6% |
| Age 75 to 84 | 5.7% | 6.4% | 4.5% |
| Age 85 and over | 2.7% | 3.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Parma Heights, OH | Strongsville, OH | United States |
| White | 74.5% | 86.7% | 59.4% |
| Black | 12.0% | 2.1% | 12.2% |
| Asian | 3.0% | 5.7% | 5.6% |
| Native American | 0.4% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.6% | 0.2% | 0.4% |
| Two or More Races | 2.5% | 2.0% | 3.2% |
| Hispanic | 6.7% | 3.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Parma Heights, OH | Strongsville, OH | United States |
| Married Population | 45.7% | 59.8% | 49.8% |
| Currently Married | 44.5% | 59.3% | 48.0% |
| Married but Separated | 1.2% | 0.5% | 1.8% |
| Single Population | 54.3% | 40.2% | 50.2% |
| Never Married | 35.1% | 24.5% | 33.8% |
| Divorced | 11.8% | 9.0% | 10.8% |
| Widowed | 7.4% | 6.8% | 5.6% |
| space5 | | | |
| Household Size | 2.22 | 2.43 | 2.60 |
| Households | 9,268 | 18,832 | 124,010,992 |
| Family Households | 5,104 | 12,880 | 80,755,759 |
| Married couple, w/children | 25.0% | 32.8% | 30.5% |
| Married couple, no children | 47.5% | 53.5% | 42.9% |
| Non Family Households | 4,164 | 5,952 | 43,255,233 |
| Single householder, w/children | 16.9% | 7.1% | 15.8% |
| Single householder, no children | 10.6% | 6.6% | 10.8% |