| | Parma Heights, OH | Brook Park, OH | United States |
| Population | 20,764 | 18,592 | 329,725,481 |
| Female Population | 51.2% | 51.7% | 50.5% |
| Male Population | 48.8% | 48.4% | 49.5% |
| Median Age | 40.7 | 42 | 38.4 |
| space3 | | | |
| Population - 2010 | 20,685 | 19,174 | 309,327,143 |
| Population - 2000 | 21,659 | 21,218 | 285,036,114 |
| Population - 1990 | 21,448 | 22,865 | 251,960,433 |
| Pop. 2000 to Now | -9.3% | -14.0% | 15.6% |
| Pop. 1990 to Now | -8.4% | -20.2% | 30.8% |
| space4 | | | |
| Population Density | 4,954.4 | 2,470.7 | 93.4 |
| Land Area | 4.2 | 7.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Parma Heights, OH | Brook Park, OH | United States |
| Age 0 to 4 | 6.5% | 7.3% | 5.9% |
| Age 5 to 9 | 4.7% | 4.9% | 6.1% |
| Age 10 to 14 | 5.6% | 4.9% | 6.6% |
| Age 15 to 17 | 3.7% | 2.9% | 3.9% |
| Age 18 to 20 | 2.9% | 3.0% | 4.0% |
| Age 21 to 24 | 4.5% | 4.1% | 5.2% |
| Age 25 to 34 | 14.4% | 14.5% | 13.8% |
| Age 35 to 44 | 12.5% | 10.9% | 12.9% |
| Age 45 to 54 | 11.9% | 11.4% | 12.6% |
| Age 55 to 59 | 6.4% | 8.2% | 6.7% |
| Age 60 to 64 | 7.0% | 7.5% | 6.3% |
| Age 65 to 74 | 11.5% | 10.5% | 9.6% |
| Age 75 to 84 | 5.7% | 7.5% | 4.5% |
| Age 85 and over | 2.7% | 2.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Parma Heights, OH | Brook Park, OH | United States |
| White | 74.5% | 81.8% | 59.4% |
| Black | 12.0% | 4.3% | 12.2% |
| Asian | 3.0% | 3.5% | 5.6% |
| Native American | 0.4% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.6% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 4.4% | 3.2% |
| Hispanic | 6.7% | 5.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Parma Heights, OH | Brook Park, OH | United States |
| Married Population | 45.7% | 46.7% | 49.8% |
| Currently Married | 44.5% | 45.1% | 48.0% |
| Married but Separated | 1.2% | 1.6% | 1.8% |
| Single Population | 54.3% | 53.3% | 50.2% |
| Never Married | 35.1% | 31.9% | 33.8% |
| Divorced | 11.8% | 13.1% | 10.8% |
| Widowed | 7.4% | 8.3% | 5.6% |
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| Household Size | 2.22 | 2.41 | 2.60 |
| Households | 9,268 | 7,671 | 124,010,992 |
| Family Households | 5,104 | 4,805 | 80,755,759 |
| Married couple, w/children | 25.0% | 25.3% | 30.5% |
| Married couple, no children | 47.5% | 43.0% | 42.9% |
| Non Family Households | 4,164 | 2,866 | 43,255,233 |
| Single householder, w/children | 16.9% | 14.9% | 15.8% |
| Single householder, no children | 10.6% | 16.7% | 10.8% |