| | Pampa, TX | Port Arthur, TX | United States |
| Population | 16,817 | 55,757 | 329,725,481 |
| Female Population | 49.0% | 50.5% | 50.5% |
| Male Population | 51.0% | 49.5% | 49.5% |
| Median Age | 35.3 | 34.5 | 38.4 |
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| Population - 2010 | 17,910 | 54,500 | 309,327,143 |
| Population - 2000 | 17,887 | 57,755 | 285,036,114 |
| Population - 1990 | 19,959 | 58,724 | 251,960,433 |
| Pop. 2000 to Now | -5.7% | -6.6% | 15.6% |
| Pop. 1990 to Now | -15.5% | -8.2% | 30.8% |
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| Population Density | 1,865.2 | 724.9 | 93.4 |
| Land Area | 9.0 | 76.9 | 3,531,905.4 |
| Water Area | 0.0 | 67.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Pampa, TX | Port Arthur, TX | United States |
| Age 0 to 4 | 7.4% | 7.7% | 5.9% |
| Age 5 to 9 | 7.3% | 7.2% | 6.1% |
| Age 10 to 14 | 8.0% | 7.6% | 6.6% |
| Age 15 to 17 | 4.1% | 4.6% | 3.9% |
| Age 18 to 20 | 4.0% | 4.4% | 4.0% |
| Age 21 to 24 | 5.6% | 5.1% | 5.2% |
| Age 25 to 34 | 12.7% | 13.9% | 13.8% |
| Age 35 to 44 | 11.7% | 11.8% | 12.9% |
| Age 45 to 54 | 11.5% | 12.0% | 12.6% |
| Age 55 to 59 | 6.7% | 6.6% | 6.7% |
| Age 60 to 64 | 4.9% | 6.3% | 6.3% |
| Age 65 to 74 | 8.8% | 7.2% | 9.6% |
| Age 75 to 84 | 5.4% | 4.1% | 4.5% |
| Age 85 and over | 2.0% | 1.4% | 1.9% |
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| Race | | | |
| | Pampa, TX | Port Arthur, TX | United States |
| White | 58.7% | 17.6% | 59.4% |
| Black | 3.9% | 42.6% | 12.2% |
| Asian | 0.8% | 6.5% | 5.6% |
| Native American | 0.9% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.3% | 0.1% | 0.2% |
| Other | 0.5% | 0.1% | 0.4% |
| Two or More Races | 1.2% | 0.8% | 3.2% |
| Hispanic | 33.6% | 32.2% | 18.4% |
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| Marriage & Family | | | |
| | Pampa, TX | Port Arthur, TX | United States |
| Married Population | 55.8% | 43.0% | 49.8% |
| Currently Married | 51.6% | 40.0% | 48.0% |
| Married but Separated | 4.1% | 3.1% | 1.8% |
| Single Population | 44.3% | 57.0% | 50.2% |
| Never Married | 23.3% | 39.1% | 33.8% |
| Divorced | 14.2% | 11.7% | 10.8% |
| Widowed | 6.8% | 6.1% | 5.6% |
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| Household Size | 2.46 | 2.71 | 2.60 |
| Households | 6,751 | 20,396 | 124,010,992 |
| Family Households | 4,279 | 12,838 | 80,755,759 |
| Married couple, w/children | 35.1% | 27.4% | 30.5% |
| Married couple, no children | 40.2% | 30.8% | 42.9% |
| Non Family Households | 2,472 | 7,558 | 43,255,233 |
| Single householder, w/children | 16.7% | 27.1% | 15.8% |
| Single householder, no children | 8.0% | 14.7% | 10.8% |