| | Bethany township, MO | Cedar Hill, MO | United States |
| Population | 3,333 | 1,761 | 329,725,481 |
| Female Population | 53.6% | 47.4% | 50.5% |
| Male Population | 46.5% | 52.6% | 49.5% |
| Median Age | 42.9 | 31.8 | 38.4 |
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| Population - 2010 | 3,679 | 1,614 | 309,327,143 |
| Population - 2000 | 3,450 | 1,703 | 285,036,114 |
| Population - 1990 | 3,295 | 1,966 | 251,960,433 |
| Pop. 2000 to Now | -1.3% | 12.6% | 15.6% |
| Pop. 1990 to Now | 3.3% | -2.5% | 30.8% |
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| Population Density | 93.1 | 767.3 | 93.4 |
| Land Area | 35.8 | 2.3 | 3,531,905.4 |
| Water Area | 0.3 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Bethany township, MO | Cedar Hill, MO | United States |
| Age 0 to 4 | 5.1% | 9.0% | 5.9% |
| Age 5 to 9 | 6.6% | 3.6% | 6.1% |
| Age 10 to 14 | 10.0% | 8.1% | 6.6% |
| Age 15 to 17 | 3.6% | 8.0% | 3.9% |
| Age 18 to 20 | 4.3% | 3.1% | 4.0% |
| Age 21 to 24 | 0.5% | 3.9% | 5.2% |
| Age 25 to 34 | 10.7% | 17.6% | 13.8% |
| Age 35 to 44 | 10.5% | 7.8% | 12.9% |
| Age 45 to 54 | 8.5% | 16.8% | 12.6% |
| Age 55 to 59 | 7.4% | 10.2% | 6.7% |
| Age 60 to 64 | 8.2% | 6.2% | 6.3% |
| Age 65 to 74 | 13.1% | 4.4% | 9.6% |
| Age 75 to 84 | 5.5% | 1.3% | 4.5% |
| Age 85 and over | 6.1% | 0.0% | 1.9% |
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| Race | | | |
| | Bethany township, MO | Cedar Hill, MO | United States |
| White | 92.3% | 88.8% | 59.4% |
| Black | 1.7% | 0.0% | 12.2% |
| Asian | 0.7% | 0.0% | 5.6% |
| Native American | 0.4% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.6% | 0.4% |
| Two or More Races | 1.1% | 8.6% | 3.2% |
| Hispanic | 3.9% | 1.9% | 18.4% |
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| Marriage & Family | | | |
| | Bethany township, MO | Cedar Hill, MO | United States |
| Married Population | 50.5% | 37.4% | 49.8% |
| Currently Married | 47.5% | 37.4% | 48.0% |
| Married but Separated | 3.0% | 0.0% | 1.8% |
| Single Population | 49.5% | 62.6% | 50.2% |
| Never Married | 21.8% | 36.0% | 33.8% |
| Divorced | 15.9% | 22.9% | 10.8% |
| Widowed | 11.8% | 3.7% | 5.6% |
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| Household Size | 2.39 | 2.73 | 2.60 |
| Households | 1,328 | 645 | 124,010,992 |
| Family Households | 775 | 466 | 80,755,759 |
| Married couple, w/children | 26.7% | 20.6% | 30.5% |
| Married couple, no children | 48.9% | 29.2% | 42.9% |
| Non Family Households | 553 | 179 | 43,255,233 |
| Single householder, w/children | 17.3% | 30.5% | 15.8% |
| Single householder, no children | 7.1% | 19.7% | 10.8% |