| | Lamesa, TX | Gainesville, TX | United States |
| Population | 8,685 | 17,146 | 329,725,481 |
| Female Population | 52.3% | 50.1% | 50.5% |
| Male Population | 47.8% | 49.9% | 49.5% |
| Median Age | 34.4 | 33.8 | 38.4 |
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| Population - 2010 | 9,412 | 15,994 | 309,327,143 |
| Population - 2000 | 9,952 | 15,538 | 285,036,114 |
| Population - 1990 | 10,809 | 14,256 | 251,960,433 |
| Pop. 2000 to Now | -8.3% | 8.6% | 15.6% |
| Pop. 1990 to Now | -15.5% | 18.4% | 30.8% |
| space4 | | | |
| Population Density | 1,700.9 | 888.3 | 93.4 |
| Land Area | 5.1 | 19.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Lamesa, TX | Gainesville, TX | United States |
| Age 0 to 4 | 8.3% | 8.4% | 5.9% |
| Age 5 to 9 | 7.1% | 7.5% | 6.1% |
| Age 10 to 14 | 9.6% | 6.1% | 6.6% |
| Age 15 to 17 | 4.3% | 4.0% | 3.9% |
| Age 18 to 20 | 4.2% | 5.0% | 4.0% |
| Age 21 to 24 | 5.8% | 6.5% | 5.2% |
| Age 25 to 34 | 12.0% | 14.8% | 13.8% |
| Age 35 to 44 | 11.6% | 11.4% | 12.9% |
| Age 45 to 54 | 10.8% | 10.8% | 12.6% |
| Age 55 to 59 | 5.9% | 5.2% | 6.7% |
| Age 60 to 64 | 4.8% | 5.2% | 6.3% |
| Age 65 to 74 | 8.7% | 8.5% | 9.6% |
| Age 75 to 84 | 5.1% | 4.1% | 4.5% |
| Age 85 and over | 2.0% | 2.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Lamesa, TX | Gainesville, TX | United States |
| White | 28.1% | 56.3% | 59.4% |
| Black | 3.6% | 6.2% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 0.1% | 1.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.6% | 1.8% | 3.2% |
| Hispanic | 67.6% | 32.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Lamesa, TX | Gainesville, TX | United States |
| Married Population | 45.2% | 49.3% | 49.8% |
| Currently Married | 42.5% | 46.7% | 48.0% |
| Married but Separated | 2.8% | 2.7% | 1.8% |
| Single Population | 54.8% | 50.7% | 50.2% |
| Never Married | 31.2% | 32.5% | 33.8% |
| Divorced | 15.8% | 10.1% | 10.8% |
| Widowed | 7.8% | 8.0% | 5.6% |
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| Household Size | 2.47 | 2.50 | 2.60 |
| Households | 3,495 | 6,710 | 124,010,992 |
| Family Households | 2,098 | 4,391 | 80,755,759 |
| Married couple, w/children | 29.5% | 33.1% | 30.5% |
| Married couple, no children | 33.1% | 35.0% | 42.9% |
| Non Family Households | 1,397 | 2,319 | 43,255,233 |
| Single householder, w/children | 22.7% | 25.1% | 15.8% |
| Single householder, no children | 14.7% | 6.9% | 10.8% |