| | Merkel, TX | Longview, TX | United States |
| Population | 2,290 | 81,967 | 329,725,481 |
| Female Population | 52.9% | 51.0% | 50.5% |
| Male Population | 47.1% | 49.0% | 49.5% |
| Median Age | 33.3 | 34.7 | 38.4 |
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| Population - 2010 | 2,591 | 80,559 | 309,327,143 |
| Population - 2000 | 2,637 | 73,344 | 285,036,114 |
| Population - 1990 | 2,469 | 70,311 | 251,960,433 |
| Pop. 2000 to Now | -0.3% | 11.4% | 15.6% |
| Pop. 1990 to Now | 6.5% | 16.2% | 30.8% |
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| Population Density | 818.4 | 1,471.8 | 93.4 |
| Land Area | 2.8 | 55.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Merkel, TX | Longview, TX | United States |
| Age 0 to 4 | 7.5% | 6.9% | 5.9% |
| Age 5 to 9 | 9.2% | 6.7% | 6.1% |
| Age 10 to 14 | 13.4% | 7.5% | 6.6% |
| Age 15 to 17 | 7.3% | 4.4% | 3.9% |
| Age 18 to 20 | 1.1% | 4.3% | 4.0% |
| Age 21 to 24 | 4.2% | 5.8% | 5.2% |
| Age 25 to 34 | 8.9% | 14.8% | 13.8% |
| Age 35 to 44 | 14.1% | 12.0% | 12.9% |
| Age 45 to 54 | 11.6% | 10.9% | 12.6% |
| Age 55 to 59 | 2.9% | 5.6% | 6.7% |
| Age 60 to 64 | 6.0% | 6.2% | 6.3% |
| Age 65 to 74 | 8.3% | 9.0% | 9.6% |
| Age 75 to 84 | 4.1% | 4.0% | 4.5% |
| Age 85 and over | 1.2% | 2.0% | 1.9% |
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| Race | | | |
| | Merkel, TX | Longview, TX | United States |
| White | 72.6% | 52.3% | 59.4% |
| Black | 0.8% | 22.0% | 12.2% |
| Asian | 0.3% | 1.2% | 5.6% |
| Native American | 0.4% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 6.1% | 3.1% | 3.2% |
| Hispanic | 19.7% | 20.9% | 18.4% |
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| Marriage & Family | | | |
| | Merkel, TX | Longview, TX | United States |
| Married Population | 55.3% | 45.6% | 49.8% |
| Currently Married | 50.8% | 43.4% | 48.0% |
| Married but Separated | 4.5% | 2.2% | 1.8% |
| Single Population | 44.7% | 54.4% | 50.2% |
| Never Married | 25.2% | 35.3% | 33.8% |
| Divorced | 13.5% | 13.2% | 10.8% |
| Widowed | 6.0% | 5.9% | 5.6% |
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| Household Size | 2.86 | 2.47 | 2.60 |
| Households | 785 | 31,730 | 124,010,992 |
| Family Households | 538 | 20,052 | 80,755,759 |
| Married couple, w/children | 44.6% | 27.7% | 30.5% |
| Married couple, no children | 28.4% | 37.9% | 42.9% |
| Non Family Households | 247 | 11,678 | 43,255,233 |
| Single householder, w/children | 19.9% | 24.4% | 15.8% |
| Single householder, no children | 7.1% | 9.9% | 10.8% |