| | Dayton, TN | Mount Juliet, TN | United States |
| Population | 7,112 | 38,059 | 329,725,481 |
| Female Population | 52.8% | 49.6% | 50.5% |
| Male Population | 47.2% | 50.4% | 49.5% |
| Median Age | 33.1 | 38.4 | 38.4 |
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| Population - 2010 | 7,277 | 24,988 | 309,327,143 |
| Population - 2000 | 6,180 | 12,366 | 285,036,114 |
| Population - 1990 | 5,671 | 5,389 | 251,960,433 |
| Pop. 2000 to Now | 18.6% | 211.6% | 15.6% |
| Pop. 1990 to Now | 29.3% | 614.9% | 30.8% |
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| Population Density | 912.3 | 1,534.5 | 93.4 |
| Land Area | 7.8 | 24.8 | 3,531,905.4 |
| Water Area | 0.2 | 0.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Dayton, TN | Mount Juliet, TN | United States |
| Age 0 to 4 | 8.2% | 6.4% | 5.9% |
| Age 5 to 9 | 5.8% | 8.3% | 6.1% |
| Age 10 to 14 | 6.3% | 7.8% | 6.6% |
| Age 15 to 17 | 3.1% | 4.5% | 3.9% |
| Age 18 to 20 | 6.4% | 2.6% | 4.0% |
| Age 21 to 24 | 9.2% | 4.3% | 5.2% |
| Age 25 to 34 | 15.1% | 10.7% | 13.8% |
| Age 35 to 44 | 12.0% | 16.2% | 12.9% |
| Age 45 to 54 | 8.9% | 13.2% | 12.6% |
| Age 55 to 59 | 4.2% | 5.8% | 6.7% |
| Age 60 to 64 | 5.1% | 6.1% | 6.3% |
| Age 65 to 74 | 10.4% | 9.5% | 9.6% |
| Age 75 to 84 | 3.9% | 3.7% | 4.5% |
| Age 85 and over | 1.5% | 0.7% | 1.9% |
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| Race | | | |
| | Dayton, TN | Mount Juliet, TN | United States |
| White | 79.6% | 79.0% | 59.4% |
| Black | 5.2% | 7.0% | 12.2% |
| Asian | 2.4% | 3.9% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 1.8% | 0.4% |
| Two or More Races | 4.5% | 2.1% | 3.2% |
| Hispanic | 8.4% | 6.0% | 18.4% |
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| Marriage & Family | | | |
| | Dayton, TN | Mount Juliet, TN | United States |
| Married Population | 43.5% | 60.9% | 49.8% |
| Currently Married | 41.4% | 60.3% | 48.0% |
| Married but Separated | 2.1% | 0.6% | 1.8% |
| Single Population | 56.5% | 39.1% | 50.2% |
| Never Married | 33.0% | 23.3% | 33.8% |
| Divorced | 14.0% | 11.3% | 10.8% |
| Widowed | 9.5% | 4.5% | 5.6% |
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| Household Size | 2.64 | 2.78 | 2.60 |
| Households | 2,475 | 13,672 | 124,010,992 |
| Family Households | 1,666 | 10,446 | 80,755,759 |
| Married couple, w/children | 22.3% | 40.2% | 30.5% |
| Married couple, no children | 38.2% | 41.9% | 42.9% |
| Non Family Households | 809 | 3,226 | 43,255,233 |
| Single householder, w/children | 21.1% | 13.9% | 15.8% |
| Single householder, no children | 18.4% | 4.0% | 10.8% |