| | Richmond Heights, OH | Willoughby Hills, OH | United States |
| Population | 10,748 | 9,929 | 329,725,481 |
| Female Population | 56.0% | 52.2% | 50.5% |
| Male Population | 44.0% | 47.8% | 49.5% |
| Median Age | 46.4 | 37.5 | 38.4 |
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| Population - 2010 | 10,551 | 9,490 | 309,327,143 |
| Population - 2000 | 10,944 | 8,595 | 285,036,114 |
| Population - 1990 | 9,611 | 8,427 | 251,960,433 |
| Pop. 2000 to Now | -6.0% | 11.0% | 15.6% |
| Pop. 1990 to Now | 7.1% | 13.2% | 30.8% |
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| Population Density | 2,422.9 | 922.7 | 93.4 |
| Land Area | 4.4 | 10.8 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Richmond Heights, OH | Willoughby Hills, OH | United States |
| Age 0 to 4 | 5.0% | 4.8% | 5.9% |
| Age 5 to 9 | 5.2% | 4.1% | 6.1% |
| Age 10 to 14 | 3.4% | 5.6% | 6.6% |
| Age 15 to 17 | 2.1% | 3.4% | 3.9% |
| Age 18 to 20 | 3.4% | 2.4% | 4.0% |
| Age 21 to 24 | 6.6% | 5.7% | 5.2% |
| Age 25 to 34 | 12.7% | 17.1% | 13.8% |
| Age 35 to 44 | 9.9% | 14.4% | 12.9% |
| Age 45 to 54 | 14.5% | 10.0% | 12.6% |
| Age 55 to 59 | 7.2% | 7.5% | 6.7% |
| Age 60 to 64 | 6.3% | 7.2% | 6.3% |
| Age 65 to 74 | 12.3% | 9.0% | 9.6% |
| Age 75 to 84 | 6.6% | 7.1% | 4.5% |
| Age 85 and over | 4.8% | 1.6% | 1.9% |
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| Race | | | |
| | Richmond Heights, OH | Willoughby Hills, OH | United States |
| White | 34.3% | 74.3% | 59.4% |
| Black | 57.4% | 16.8% | 12.2% |
| Asian | 1.8% | 6.3% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.3% | 0.0% | 0.4% |
| Two or More Races | 3.1% | 0.4% | 3.2% |
| Hispanic | 3.0% | 2.2% | 18.4% |
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| Marriage & Family | | | |
| | Richmond Heights, OH | Willoughby Hills, OH | United States |
| Married Population | 35.9% | 49.6% | 49.8% |
| Currently Married | 33.3% | 48.5% | 48.0% |
| Married but Separated | 2.6% | 1.1% | 1.8% |
| Single Population | 64.1% | 50.4% | 50.2% |
| Never Married | 39.7% | 35.5% | 33.8% |
| Divorced | 12.7% | 11.1% | 10.8% |
| Widowed | 11.8% | 3.7% | 5.6% |
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| Household Size | 2.10 | 2.04 | 2.60 |
| Households | 4,966 | 4,861 | 124,010,992 |
| Family Households | 2,513 | 2,744 | 80,755,759 |
| Married couple, w/children | 15.2% | 24.4% | 30.5% |
| Married couple, no children | 40.5% | 47.5% | 42.9% |
| Non Family Households | 2,453 | 2,117 | 43,255,233 |
| Single householder, w/children | 21.4% | 15.8% | 15.8% |
| Single householder, no children | 23.0% | 12.3% | 10.8% |