| | Smithville, TN | Dickson, TN | United States |
| Population | 4,949 | 15,855 | 329,725,481 |
| Female Population | 54.3% | 50.8% | 50.5% |
| Male Population | 45.7% | 49.2% | 49.5% |
| Median Age | 42.2 | 35 | 38.4 |
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| Population - 2010 | 4,520 | 14,662 | 309,327,143 |
| Population - 2000 | 3,994 | 12,244 | 285,036,114 |
| Population - 1990 | 3,791 | 8,791 | 251,960,433 |
| Pop. 2000 to Now | 24.6% | 26.9% | 15.6% |
| Pop. 1990 to Now | 31.3% | 76.8% | 30.8% |
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| Population Density | 845.4 | 789.8 | 93.4 |
| Land Area | 5.9 | 20.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Smithville, TN | Dickson, TN | United States |
| Age 0 to 4 | 8.9% | 7.1% | 5.9% |
| Age 5 to 9 | 7.4% | 6.7% | 6.1% |
| Age 10 to 14 | 6.2% | 7.0% | 6.6% |
| Age 15 to 17 | 3.4% | 4.0% | 3.9% |
| Age 18 to 20 | 0.7% | 4.3% | 4.0% |
| Age 21 to 24 | 3.8% | 4.9% | 5.2% |
| Age 25 to 34 | 10.8% | 16.2% | 13.8% |
| Age 35 to 44 | 16.3% | 13.1% | 12.9% |
| Age 45 to 54 | 15.4% | 11.7% | 12.6% |
| Age 55 to 59 | 6.0% | 5.6% | 6.7% |
| Age 60 to 64 | 6.4% | 5.0% | 6.3% |
| Age 65 to 74 | 5.3% | 9.4% | 9.6% |
| Age 75 to 84 | 5.8% | 3.7% | 4.5% |
| Age 85 and over | 3.6% | 1.4% | 1.9% |
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| Race | | | |
| | Smithville, TN | Dickson, TN | United States |
| White | 74.2% | 83.2% | 59.4% |
| Black | 2.9% | 7.5% | 12.2% |
| Asian | 0.6% | 0.6% | 5.6% |
| Native American | 1.8% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.7% | 2.3% | 3.2% |
| Hispanic | 19.8% | 6.1% | 18.4% |
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| Marriage & Family | | | |
| | Smithville, TN | Dickson, TN | United States |
| Married Population | 54.2% | 43.8% | 49.8% |
| Currently Married | 52.7% | 40.9% | 48.0% |
| Married but Separated | 1.5% | 2.9% | 1.8% |
| Single Population | 45.8% | 56.2% | 50.2% |
| Never Married | 17.3% | 34.6% | 33.8% |
| Divorced | 19.7% | 15.0% | 10.8% |
| Widowed | 8.8% | 6.6% | 5.6% |
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| Household Size | 2.37 | 2.69 | 2.60 |
| Households | 2,001 | 5,775 | 124,010,992 |
| Family Households | 1,060 | 3,841 | 80,755,759 |
| Married couple, w/children | 55.4% | 31.0% | 30.5% |
| Married couple, no children | 27.9% | 30.9% | 42.9% |
| Non Family Households | 941 | 1,934 | 43,255,233 |
| Single householder, w/children | 12.3% | 24.1% | 15.8% |
| Single householder, no children | 4.4% | 14.0% | 10.8% |