| | Marble Falls, TX | Jacksonville, TX | United States |
| Population | 6,892 | 14,029 | 329,725,481 |
| Female Population | 50.2% | 51.6% | 50.5% |
| Male Population | 49.8% | 48.5% | 49.5% |
| Median Age | 41.1 | 30.4 | 38.4 |
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| Population - 2010 | 6,058 | 14,570 | 309,327,143 |
| Population - 2000 | 4,959 | 13,868 | 285,036,114 |
| Population - 1990 | 4,007 | 12,765 | 251,960,433 |
| Pop. 2000 to Now | 43.5% | 6.9% | 15.6% |
| Pop. 1990 to Now | 77.5% | 16.2% | 30.8% |
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| Population Density | 482.3 | 988.6 | 93.4 |
| Land Area | 14.3 | 14.2 | 3,531,905.4 |
| Water Area | 0.6 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Marble Falls, TX | Jacksonville, TX | United States |
| Age 0 to 4 | 3.1% | 10.1% | 5.9% |
| Age 5 to 9 | 5.5% | 7.5% | 6.1% |
| Age 10 to 14 | 6.6% | 8.2% | 6.6% |
| Age 15 to 17 | 5.9% | 5.3% | 3.9% |
| Age 18 to 20 | 1.4% | 6.0% | 4.0% |
| Age 21 to 24 | 2.7% | 7.3% | 5.2% |
| Age 25 to 34 | 12.2% | 10.6% | 13.8% |
| Age 35 to 44 | 16.2% | 11.0% | 12.9% |
| Age 45 to 54 | 8.6% | 9.5% | 12.6% |
| Age 55 to 59 | 7.6% | 4.8% | 6.7% |
| Age 60 to 64 | 8.7% | 4.9% | 6.3% |
| Age 65 to 74 | 11.1% | 7.7% | 9.6% |
| Age 75 to 84 | 6.7% | 4.1% | 4.5% |
| Age 85 and over | 3.7% | 3.0% | 1.9% |
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| Race | | | |
| | Marble Falls, TX | Jacksonville, TX | United States |
| White | 71.2% | 36.6% | 59.4% |
| Black | 4.2% | 18.8% | 12.2% |
| Asian | 0.2% | 0.2% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 1.6% | 1.8% | 3.2% |
| Hispanic | 22.9% | 42.5% | 18.4% |
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| Marriage & Family | | | |
| | Marble Falls, TX | Jacksonville, TX | United States |
| Married Population | 48.8% | 47.6% | 49.8% |
| Currently Married | 48.5% | 46.2% | 48.0% |
| Married but Separated | 0.4% | 1.4% | 1.8% |
| Single Population | 51.2% | 52.4% | 50.2% |
| Never Married | 25.7% | 34.1% | 33.8% |
| Divorced | 14.0% | 10.8% | 10.8% |
| Widowed | 11.5% | 7.5% | 5.6% |
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| Household Size | 2.40 | 2.81 | 2.60 |
| Households | 2,857 | 4,771 | 124,010,992 |
| Family Households | 1,678 | 3,632 | 80,755,759 |
| Married couple, w/children | 41.1% | 27.8% | 30.5% |
| Married couple, no children | 31.5% | 35.4% | 42.9% |
| Non Family Households | 1,179 | 1,139 | 43,255,233 |
| Single householder, w/children | 9.8% | 25.2% | 15.8% |
| Single householder, no children | 17.6% | 11.6% | 10.8% |