| | Marlin, TX | Bryan, TX | United States |
| Population | 5,512 | 85,204 | 329,725,481 |
| Female Population | 52.5% | 49.5% | 50.5% |
| Male Population | 47.6% | 50.5% | 49.5% |
| Median Age | 36.5 | 31.3 | 38.4 |
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| Population - 2010 | 5,976 | 76,526 | 309,327,143 |
| Population - 2000 | 6,628 | 65,660 | 285,036,114 |
| Population - 1990 | 6,386 | 55,002 | 251,960,433 |
| Pop. 2000 to Now | -16.3% | 34.3% | 15.6% |
| Pop. 1990 to Now | -13.1% | 60.3% | 30.8% |
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| Population Density | 1,220.3 | 1,864.7 | 93.4 |
| Land Area | 4.5 | 45.7 | 3,531,905.4 |
| Water Area | 0.1 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Marlin, TX | Bryan, TX | United States |
| Age 0 to 4 | 6.4% | 7.1% | 5.9% |
| Age 5 to 9 | 9.8% | 6.7% | 6.1% |
| Age 10 to 14 | 5.2% | 6.9% | 6.6% |
| Age 15 to 17 | 2.1% | 3.9% | 3.9% |
| Age 18 to 20 | 4.1% | 4.6% | 4.0% |
| Age 21 to 24 | 4.0% | 8.4% | 5.2% |
| Age 25 to 34 | 13.0% | 18.4% | 13.8% |
| Age 35 to 44 | 14.9% | 12.7% | 12.9% |
| Age 45 to 54 | 13.7% | 10.2% | 12.6% |
| Age 55 to 59 | 8.4% | 5.5% | 6.7% |
| Age 60 to 64 | 2.6% | 4.3% | 6.3% |
| Age 65 to 74 | 9.2% | 6.5% | 9.6% |
| Age 75 to 84 | 4.3% | 3.1% | 4.5% |
| Age 85 and over | 2.5% | 1.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Marlin, TX | Bryan, TX | United States |
| White | 27.0% | 37.7% | 59.4% |
| Black | 45.9% | 17.5% | 12.2% |
| Asian | 0.3% | 2.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.5% | 1.8% | 3.2% |
| Hispanic | 26.3% | 40.6% | 18.4% |
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| Marriage & Family | | | |
| | Marlin, TX | Bryan, TX | United States |
| Married Population | 33.7% | 42.1% | 49.8% |
| Currently Married | 27.3% | 38.8% | 48.0% |
| Married but Separated | 6.4% | 3.4% | 1.8% |
| Single Population | 66.3% | 57.9% | 50.2% |
| Never Married | 39.6% | 41.8% | 33.8% |
| Divorced | 18.2% | 11.5% | 10.8% |
| Widowed | 8.5% | 4.5% | 5.6% |
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| Household Size | 2.76 | 2.61 | 2.60 |
| Households | 1,767 | 31,029 | 124,010,992 |
| Family Households | 850 | 18,070 | 80,755,759 |
| Married couple, w/children | 23.9% | 28.2% | 30.5% |
| Married couple, no children | 30.0% | 33.9% | 42.9% |
| Non Family Households | 917 | 12,959 | 43,255,233 |
| Single householder, w/children | 24.6% | 27.1% | 15.8% |
| Single householder, no children | 21.5% | 10.8% | 10.8% |