| | Richmond Heights, MO | Weston, MO | United States |
| Population | 9,188 | 1,850 | 329,725,481 |
| Female Population | 51.7% | 51.2% | 50.5% |
| Male Population | 48.3% | 48.8% | 49.5% |
| Median Age | 37.4 | 40.5 | 38.4 |
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| Population - 2010 | 8,546 | 1,650 | 309,327,143 |
| Population - 2000 | 9,602 | 1,631 | 285,036,114 |
| Population - 1990 | 10,448 | 1,528 | 251,960,433 |
| Pop. 2000 to Now | -8.6% | 12.5% | 15.6% |
| Pop. 1990 to Now | -16.0% | 20.0% | 30.8% |
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| Population Density | 4,010.5 | 552.4 | 93.4 |
| Land Area | 2.3 | 3.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Richmond Heights, MO | Weston, MO | United States |
| Age 0 to 4 | 6.7% | 5.0% | 5.9% |
| Age 5 to 9 | 6.5% | 6.9% | 6.1% |
| Age 10 to 14 | 5.1% | 7.5% | 6.6% |
| Age 15 to 17 | 1.9% | 5.1% | 3.9% |
| Age 18 to 20 | 2.0% | 3.4% | 4.0% |
| Age 21 to 24 | 3.4% | 3.0% | 5.2% |
| Age 25 to 34 | 20.2% | 12.8% | 13.8% |
| Age 35 to 44 | 19.8% | 11.2% | 12.9% |
| Age 45 to 54 | 10.6% | 11.8% | 12.6% |
| Age 55 to 59 | 5.6% | 4.5% | 6.7% |
| Age 60 to 64 | 5.4% | 6.2% | 6.3% |
| Age 65 to 74 | 7.1% | 11.1% | 9.6% |
| Age 75 to 84 | 4.1% | 9.5% | 4.5% |
| Age 85 and over | 1.7% | 1.9% | 1.9% |
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| Race | | | |
| | Richmond Heights, MO | Weston, MO | United States |
| White | 83.1% | 90.4% | 59.4% |
| Black | 8.2% | 1.2% | 12.2% |
| Asian | 3.6% | 0.4% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.1% | 0.6% | 0.4% |
| Two or More Races | 2.6% | 5.5% | 3.2% |
| Hispanic | 2.5% | 1.7% | 18.4% |
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| Marriage & Family | | | |
| | Richmond Heights, MO | Weston, MO | United States |
| Married Population | 52.8% | 53.1% | 49.8% |
| Currently Married | 51.1% | 51.5% | 48.0% |
| Married but Separated | 1.7% | 1.6% | 1.8% |
| Single Population | 47.2% | 46.9% | 50.2% |
| Never Married | 33.3% | 22.7% | 33.8% |
| Divorced | 9.9% | 16.4% | 10.8% |
| Widowed | 3.9% | 7.8% | 5.6% |
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| Household Size | 2.11 | 2.44 | 2.60 |
| Households | 4,344 | 759 | 124,010,992 |
| Family Households | 2,129 | 490 | 80,755,759 |
| Married couple, w/children | 38.9% | 32.9% | 30.5% |
| Married couple, no children | 47.7% | 42.4% | 42.9% |
| Non Family Households | 2,215 | 269 | 43,255,233 |
| Single householder, w/children | 6.4% | 21.0% | 15.8% |
| Single householder, no children | 7.0% | 3.7% | 10.8% |