| | Lafayette, TN | Smithville, TN | United States |
| Population | 5,458 | 4,949 | 329,725,481 |
| Female Population | 55.0% | 54.3% | 50.5% |
| Male Population | 45.0% | 45.7% | 49.5% |
| Median Age | 33 | 42.2 | 38.4 |
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| Population - 2010 | 4,541 | 4,520 | 309,327,143 |
| Population - 2000 | 3,885 | 3,994 | 285,036,114 |
| Population - 1990 | 3,641 | 3,791 | 251,960,433 |
| Pop. 2000 to Now | 35.7% | 24.6% | 15.6% |
| Pop. 1990 to Now | 44.8% | 31.3% | 30.8% |
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| Population Density | 1,044.0 | 845.4 | 93.4 |
| Land Area | 5.2 | 5.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Lafayette, TN | Smithville, TN | United States |
| Age 0 to 4 | 13.1% | 8.9% | 5.9% |
| Age 5 to 9 | 4.7% | 7.4% | 6.1% |
| Age 10 to 14 | 4.5% | 6.2% | 6.6% |
| Age 15 to 17 | 1.2% | 3.4% | 3.9% |
| Age 18 to 20 | 6.3% | 0.7% | 4.0% |
| Age 21 to 24 | 7.3% | 3.8% | 5.2% |
| Age 25 to 34 | 16.6% | 10.8% | 13.8% |
| Age 35 to 44 | 9.7% | 16.3% | 12.9% |
| Age 45 to 54 | 9.7% | 15.4% | 12.6% |
| Age 55 to 59 | 2.8% | 6.0% | 6.7% |
| Age 60 to 64 | 4.4% | 6.4% | 6.3% |
| Age 65 to 74 | 12.1% | 5.3% | 9.6% |
| Age 75 to 84 | 5.9% | 5.8% | 4.5% |
| Age 85 and over | 1.7% | 3.6% | 1.9% |
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| Race | | | |
| | Lafayette, TN | Smithville, TN | United States |
| White | 85.6% | 74.2% | 59.4% |
| Black | 0.5% | 2.9% | 12.2% |
| Asian | 0.0% | 0.6% | 5.6% |
| Native American | 0.1% | 1.8% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.3% | 0.7% | 3.2% |
| Hispanic | 12.4% | 19.8% | 18.4% |
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| Marriage & Family | | | |
| | Lafayette, TN | Smithville, TN | United States |
| Married Population | 52.5% | 54.2% | 49.8% |
| Currently Married | 43.5% | 52.7% | 48.0% |
| Married but Separated | 9.0% | 1.5% | 1.8% |
| Single Population | 47.5% | 45.8% | 50.2% |
| Never Married | 28.6% | 17.3% | 33.8% |
| Divorced | 9.9% | 19.7% | 10.8% |
| Widowed | 9.0% | 8.8% | 5.6% |
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| Household Size | 2.49 | 2.37 | 2.60 |
| Households | 2,086 | 2,001 | 124,010,992 |
| Family Households | 1,275 | 1,060 | 80,755,759 |
| Married couple, w/children | 26.4% | 55.4% | 30.5% |
| Married couple, no children | 35.9% | 27.9% | 42.9% |
| Non Family Households | 811 | 941 | 43,255,233 |
| Single householder, w/children | 22.7% | 12.3% | 15.8% |
| Single householder, no children | 14.9% | 4.4% | 10.8% |