| | Belle Meade, TN | Oak Ridge, TN | United States |
| Population | 3,016 | 31,087 | 329,725,481 |
| Female Population | 52.3% | 51.2% | 50.5% |
| Male Population | 47.8% | 48.9% | 49.5% |
| Median Age | 45.7 | 39.5 | 38.4 |
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| Population - 2010 | 2,898 | 29,314 | 309,327,143 |
| Population - 2000 | 2,943 | 27,387 | 285,036,114 |
| Population - 1990 | 2,839 | 27,310 | 251,960,433 |
| Pop. 2000 to Now | -5.3% | 7.1% | 15.6% |
| Pop. 1990 to Now | -1.8% | 7.4% | 30.8% |
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| Population Density | 982.4 | 364.7 | 93.4 |
| Land Area | 3.1 | 85.3 | 3,531,905.4 |
| Water Area | 0.0 | 4.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Belle Meade, TN | Oak Ridge, TN | United States |
| Age 0 to 4 | 4.3% | 4.9% | 5.9% |
| Age 5 to 9 | 7.2% | 6.6% | 6.1% |
| Age 10 to 14 | 9.4% | 8.6% | 6.6% |
| Age 15 to 17 | 3.9% | 5.1% | 3.9% |
| Age 18 to 20 | 5.1% | 2.5% | 4.0% |
| Age 21 to 24 | 4.1% | 3.6% | 5.2% |
| Age 25 to 34 | 5.1% | 13.0% | 13.8% |
| Age 35 to 44 | 9.6% | 12.4% | 12.9% |
| Age 45 to 54 | 16.0% | 12.4% | 12.6% |
| Age 55 to 59 | 8.0% | 6.4% | 6.7% |
| Age 60 to 64 | 9.0% | 6.7% | 6.3% |
| Age 65 to 74 | 9.9% | 11.0% | 9.6% |
| Age 75 to 84 | 5.9% | 4.1% | 4.5% |
| Age 85 and over | 2.4% | 2.7% | 1.9% |
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| Race | | | |
| | Belle Meade, TN | Oak Ridge, TN | United States |
| White | 97.7% | 79.5% | 59.4% |
| Black | 0.6% | 6.3% | 12.2% |
| Asian | 0.8% | 2.9% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.2% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.9% | 4.8% | 3.2% |
| Hispanic | 0.0% | 6.0% | 18.4% |
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| Marriage & Family | | | |
| | Belle Meade, TN | Oak Ridge, TN | United States |
| Married Population | 71.6% | 52.2% | 49.8% |
| Currently Married | 71.3% | 50.0% | 48.0% |
| Married but Separated | 0.2% | 2.3% | 1.8% |
| Single Population | 28.4% | 47.8% | 50.2% |
| Never Married | 23.0% | 27.8% | 33.8% |
| Divorced | 2.4% | 12.9% | 10.8% |
| Widowed | 3.0% | 7.1% | 5.6% |
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| Household Size | 3.06 | 2.40 | 2.60 |
| Households | 981 | 12,839 | 124,010,992 |
| Family Households | 874 | 8,057 | 80,755,759 |
| Married couple, w/children | 38.9% | 32.3% | 30.5% |
| Married couple, no children | 57.0% | 39.4% | 42.9% |
| Non Family Households | 107 | 4,782 | 43,255,233 |
| Single householder, w/children | 1.4% | 19.0% | 15.8% |
| Single householder, no children | 2.7% | 9.2% | 10.8% |