| | Smithville, MS | Swartz Creek, MI | United States |
| Population | 671 | 5,839 | 329,725,481 |
| Female Population | 45.8% | 53.8% | 50.5% |
| Male Population | 54.3% | 46.2% | 49.5% |
| Median Age | 40.2 | 41.5 | 38.4 |
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| Population - 2010 | 936 | 5,777 | 309,327,143 |
| Population - 2000 | 882 | 5,102 | 285,036,114 |
| Population - 1990 | 871 | 4,851 | 251,960,433 |
| Pop. 2000 to Now | -16.3% | 7.6% | 15.6% |
| Pop. 1990 to Now | -15.3% | 13.2% | 30.8% |
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| Population Density | 452.2 | 1,436.1 | 93.4 |
| Land Area | 1.5 | 4.1 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Smithville, MS | Swartz Creek, MI | United States |
| Age 0 to 4 | 4.9% | 4.7% | 5.9% |
| Age 5 to 9 | 5.4% | 3.3% | 6.1% |
| Age 10 to 14 | 6.0% | 3.6% | 6.6% |
| Age 15 to 17 | 1.6% | 6.6% | 3.9% |
| Age 18 to 20 | 8.9% | 5.3% | 4.0% |
| Age 21 to 24 | 9.8% | 4.1% | 5.2% |
| Age 25 to 34 | 12.4% | 16.0% | 13.8% |
| Age 35 to 44 | 7.6% | 8.5% | 12.9% |
| Age 45 to 54 | 11.3% | 12.5% | 12.6% |
| Age 55 to 59 | 7.3% | 2.8% | 6.7% |
| Age 60 to 64 | 4.6% | 7.5% | 6.3% |
| Age 65 to 74 | 10.9% | 9.4% | 9.6% |
| Age 75 to 84 | 7.6% | 10.8% | 4.5% |
| Age 85 and over | 1.6% | 4.8% | 1.9% |
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| Race | | | |
| | Smithville, MS | Swartz Creek, MI | United States |
| White | 96.4% | 92.9% | 59.4% |
| Black | 0.4% | 0.6% | 12.2% |
| Asian | 0.0% | 0.7% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 3.1% | 2.3% | 3.2% |
| Hispanic | 0.0% | 3.5% | 18.4% |
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| Marriage & Family | | | |
| | Smithville, MS | Swartz Creek, MI | United States |
| Married Population | 47.5% | 47.9% | 49.8% |
| Currently Married | 46.3% | 46.5% | 48.0% |
| Married but Separated | 1.2% | 1.4% | 1.8% |
| Single Population | 52.5% | 52.1% | 50.2% |
| Never Married | 31.5% | 28.6% | 33.8% |
| Divorced | 11.2% | 14.7% | 10.8% |
| Widowed | 9.8% | 8.9% | 5.6% |
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| Household Size | 2.63 | 2.15 | 2.60 |
| Households | 255 | 2,702 | 124,010,992 |
| Family Households | 159 | 1,673 | 80,755,759 |
| Married couple, w/children | 28.3% | 30.0% | 30.5% |
| Married couple, no children | 52.2% | 43.1% | 42.9% |
| Non Family Households | 96 | 1,029 | 43,255,233 |
| Single householder, w/children | 8.8% | 15.3% | 15.8% |
| Single householder, no children | 10.7% | 11.6% | 10.8% |