| | Gilmer, TX | Tyler, TX | United States |
| Population | 4,802 | 104,945 | 329,725,481 |
| Female Population | 53.8% | 52.3% | 50.5% |
| Male Population | 46.2% | 47.7% | 49.5% |
| Median Age | 32.5 | 34.6 | 38.4 |
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| Population - 2010 | 4,907 | 97,047 | 309,327,143 |
| Population - 2000 | 4,799 | 83,650 | 285,036,114 |
| Population - 1990 | 4,822 | 75,450 | 251,960,433 |
| Pop. 2000 to Now | 8.1% | 29.4% | 15.6% |
| Pop. 1990 to Now | 7.6% | 43.4% | 30.8% |
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| Population Density | 1,267.0 | 1,853.2 | 93.4 |
| Land Area | 3.8 | 56.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.5 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Gilmer, TX | Tyler, TX | United States |
| Age 0 to 4 | 7.9% | 6.5% | 5.9% |
| Age 5 to 9 | 6.4% | 6.6% | 6.1% |
| Age 10 to 14 | 7.0% | 6.4% | 6.6% |
| Age 15 to 17 | 5.6% | 3.7% | 3.9% |
| Age 18 to 20 | 6.8% | 5.5% | 4.0% |
| Age 21 to 24 | 5.6% | 7.3% | 5.2% |
| Age 25 to 34 | 14.2% | 14.6% | 13.8% |
| Age 35 to 44 | 8.4% | 11.4% | 12.9% |
| Age 45 to 54 | 10.2% | 11.7% | 12.6% |
| Age 55 to 59 | 3.0% | 5.2% | 6.7% |
| Age 60 to 64 | 6.0% | 5.5% | 6.3% |
| Age 65 to 74 | 11.0% | 8.5% | 9.6% |
| Age 75 to 84 | 5.1% | 4.7% | 4.5% |
| Age 85 and over | 2.9% | 2.3% | 1.9% |
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| Race | | | |
| | Gilmer, TX | Tyler, TX | United States |
| White | 65.8% | 48.2% | 59.4% |
| Black | 22.9% | 24.8% | 12.2% |
| Asian | 0.1% | 2.6% | 5.6% |
| Native American | 0.5% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.6% | 0.2% | 0.4% |
| Two or More Races | 3.4% | 2.2% | 3.2% |
| Hispanic | 5.6% | 21.7% | 18.4% |
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| Marriage & Family | | | |
| | Gilmer, TX | Tyler, TX | United States |
| Married Population | 33.1% | 47.4% | 49.8% |
| Currently Married | 31.5% | 45.4% | 48.0% |
| Married but Separated | 1.6% | 2.0% | 1.8% |
| Single Population | 66.9% | 52.6% | 50.2% |
| Never Married | 42.9% | 34.9% | 33.8% |
| Divorced | 11.6% | 10.9% | 10.8% |
| Widowed | 12.4% | 6.8% | 5.6% |
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| Household Size | 2.63 | 2.66 | 2.60 |
| Households | 1,717 | 37,601 | 124,010,992 |
| Family Households | 986 | 24,104 | 80,755,759 |
| Married couple, w/children | 25.9% | 32.3% | 30.5% |
| Married couple, no children | 22.8% | 38.7% | 42.9% |
| Non Family Households | 731 | 13,497 | 43,255,233 |
| Single householder, w/children | 28.9% | 16.7% | 15.8% |
| Single householder, no children | 22.4% | 12.3% | 10.8% |