| | Dumas, TX | Carroll, IA | United States |
| Population | 14,565 | 10,261 | 329,725,481 |
| Female Population | 47.7% | 53.0% | 50.5% |
| Male Population | 52.3% | 47.0% | 49.5% |
| Median Age | 28.9 | 43.2 | 38.4 |
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| Population - 2010 | 14,756 | 10,135 | 309,327,143 |
| Population - 2000 | 13,747 | 10,106 | 285,036,114 |
| Population - 1990 | 12,871 | 9,579 | 251,960,433 |
| Pop. 2000 to Now | -1.0% | -4.1% | 15.6% |
| Pop. 1990 to Now | 5.8% | 1.2% | 30.8% |
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| Population Density | 2,636.7 | 1,790.8 | 93.4 |
| Land Area | 5.5 | 5.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Dumas, TX | Carroll, IA | United States |
| Age 0 to 4 | 9.1% | 5.1% | 5.9% |
| Age 5 to 9 | 11.4% | 7.8% | 6.1% |
| Age 10 to 14 | 8.7% | 6.5% | 6.6% |
| Age 15 to 17 | 4.9% | 3.6% | 3.9% |
| Age 18 to 20 | 3.3% | 2.6% | 4.0% |
| Age 21 to 24 | 6.8% | 4.0% | 5.2% |
| Age 25 to 34 | 13.6% | 11.4% | 13.8% |
| Age 35 to 44 | 12.4% | 11.1% | 12.9% |
| Age 45 to 54 | 8.7% | 12.4% | 12.6% |
| Age 55 to 59 | 5.2% | 6.3% | 6.7% |
| Age 60 to 64 | 5.0% | 7.6% | 6.3% |
| Age 65 to 74 | 6.1% | 10.1% | 9.6% |
| Age 75 to 84 | 2.9% | 7.0% | 4.5% |
| Age 85 and over | 2.1% | 4.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Dumas, TX | Carroll, IA | United States |
| White | 30.9% | 93.4% | 59.4% |
| Black | 3.2% | 0.5% | 12.2% |
| Asian | 3.3% | 0.6% | 5.6% |
| Native American | 0.3% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.0% | 0.4% |
| Two or More Races | 3.2% | 1.8% | 3.2% |
| Hispanic | 58.9% | 3.8% | 18.4% |
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| Marriage & Family | | | |
| | Dumas, TX | Carroll, IA | United States |
| Married Population | 52.7% | 48.1% | 49.8% |
| Currently Married | 51.6% | 48.0% | 48.0% |
| Married but Separated | 1.0% | 0.2% | 1.8% |
| Single Population | 47.3% | 51.9% | 50.2% |
| Never Married | 32.7% | 30.4% | 33.8% |
| Divorced | 8.1% | 10.8% | 10.8% |
| Widowed | 6.6% | 10.6% | 5.6% |
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| Household Size | 3.23 | 2.19 | 2.60 |
| Households | 4,466 | 4,562 | 124,010,992 |
| Family Households | 3,326 | 2,602 | 80,755,759 |
| Married couple, w/children | 42.2% | 25.6% | 30.5% |
| Married couple, no children | 34.6% | 47.7% | 42.9% |
| Non Family Households | 1,140 | 1,960 | 43,255,233 |
| Single householder, w/children | 17.3% | 18.6% | 15.8% |
| Single householder, no children | 5.9% | 8.1% | 10.8% |