| | Smithville, TX | Jacksonville, NC | United States |
| Population | 3,920 | 73,224 | 329,725,481 |
| Female Population | 49.0% | 38.5% | 50.5% |
| Male Population | 51.0% | 61.5% | 49.5% |
| Median Age | 38.7 | 23.2 | 38.4 |
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| Population - 2010 | 3,818 | 78,056 | 309,327,143 |
| Population - 2000 | 3,901 | 66,715 | 285,036,114 |
| Population - 1990 | 3,196 | 30,013 | 251,960,433 |
| Pop. 2000 to Now | 19.6% | 14.3% | 15.6% |
| Pop. 1990 to Now | 45.9% | 154.2% | 30.8% |
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| Population Density | 1,066.4 | 1,508.1 | 93.4 |
| Land Area | 3.7 | 48.6 | 3,531,905.4 |
| Water Area | 0.0 | 7.6 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Smithville, TX | Jacksonville, NC | United States |
| Age 0 to 4 | 5.5% | 8.1% | 5.9% |
| Age 5 to 9 | 8.5% | 5.5% | 6.1% |
| Age 10 to 14 | 7.0% | 4.6% | 6.6% |
| Age 15 to 17 | 3.1% | 2.3% | 3.9% |
| Age 18 to 20 | 2.2% | 15.3% | 4.0% |
| Age 21 to 24 | 2.7% | 22.4% | 5.2% |
| Age 25 to 34 | 12.7% | 17.0% | 13.8% |
| Age 35 to 44 | 14.0% | 7.8% | 12.9% |
| Age 45 to 54 | 17.7% | 5.0% | 12.6% |
| Age 55 to 59 | 4.0% | 3.0% | 6.7% |
| Age 60 to 64 | 4.9% | 2.8% | 6.3% |
| Age 65 to 74 | 8.5% | 4.1% | 9.6% |
| Age 75 to 84 | 6.1% | 1.4% | 4.5% |
| Age 85 and over | 3.2% | 0.7% | 1.9% |
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| Race | | | |
| | Smithville, TX | Jacksonville, NC | United States |
| White | 71.4% | 54.2% | 59.4% |
| Black | 8.7% | 17.6% | 12.2% |
| Asian | 0.1% | 3.0% | 5.6% |
| Native American | 0.8% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 3.8% | 5.7% | 3.2% |
| Hispanic | 15.4% | 19.1% | 18.4% |
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| Marriage & Family | | | |
| | Smithville, TX | Jacksonville, NC | United States |
| Married Population | 56.0% | 44.7% | 49.8% |
| Currently Married | 54.3% | 42.1% | 48.0% |
| Married but Separated | 1.6% | 2.6% | 1.8% |
| Single Population | 44.0% | 55.3% | 50.2% |
| Never Married | 25.4% | 45.2% | 33.8% |
| Divorced | 12.4% | 7.6% | 10.8% |
| Widowed | 6.3% | 2.6% | 5.6% |
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| Household Size | 2.64 | 2.50 | 2.60 |
| Households | 1,464 | 21,614 | 124,010,992 |
| Family Households | 970 | 15,321 | 80,755,759 |
| Married couple, w/children | 36.6% | 35.0% | 30.5% |
| Married couple, no children | 41.5% | 40.0% | 42.9% |
| Non Family Households | 494 | 6,293 | 43,255,233 |
| Single householder, w/children | 18.7% | 17.3% | 15.8% |
| Single householder, no children | 3.2% | 7.6% | 10.8% |