| | Seymour, TX | Caddo, OK | United States |
| Population | 2,940 | 1,094 | 329,725,481 |
| Female Population | 52.5% | 48.2% | 50.5% |
| Male Population | 47.5% | 51.8% | 49.5% |
| Median Age | 45 | 39.1 | 38.4 |
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| Population - 2010 | 2,721 | 1,012 | 309,327,143 |
| Population - 2000 | 2,908 | 944 | 285,036,114 |
| Population - 1990 | 3,185 | 918 | 251,960,433 |
| Pop. 2000 to Now | -12.1% | 18.0% | 15.6% |
| Pop. 1990 to Now | -19.7% | 21.4% | 30.8% |
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| Population Density | 1,005.8 | 429.4 | 93.4 |
| Land Area | 2.9 | 2.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Seymour, TX | Caddo, OK | United States |
| Age 0 to 4 | 3.0% | 3.0% | 5.9% |
| Age 5 to 9 | 7.7% | 3.0% | 6.1% |
| Age 10 to 14 | 9.6% | 6.7% | 6.6% |
| Age 15 to 17 | 4.4% | 12.0% | 3.9% |
| Age 18 to 20 | 1.7% | 6.8% | 4.0% |
| Age 21 to 24 | 3.8% | 2.9% | 5.2% |
| Age 25 to 34 | 7.2% | 9.0% | 13.8% |
| Age 35 to 44 | 12.7% | 13.3% | 12.9% |
| Age 45 to 54 | 10.2% | 16.6% | 12.6% |
| Age 55 to 59 | 10.0% | 4.5% | 6.7% |
| Age 60 to 64 | 7.8% | 5.2% | 6.3% |
| Age 65 to 74 | 10.5% | 9.0% | 9.6% |
| Age 75 to 84 | 9.5% | 6.5% | 4.5% |
| Age 85 and over | 2.1% | 1.6% | 1.9% |
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| Race | | | |
| | Seymour, TX | Caddo, OK | United States |
| White | 72.2% | 74.7% | 59.4% |
| Black | 4.2% | 0.2% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.1% | 13.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.5% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 6.7% | 10.1% | 3.2% |
| Hispanic | 16.3% | 1.7% | 18.4% |
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| Marriage & Family | | | |
| | Seymour, TX | Caddo, OK | United States |
| Married Population | 56.2% | 48.8% | 49.8% |
| Currently Married | 53.4% | 46.7% | 48.0% |
| Married but Separated | 2.7% | 2.1% | 1.8% |
| Single Population | 43.8% | 51.2% | 50.2% |
| Never Married | 22.5% | 32.9% | 33.8% |
| Divorced | 10.4% | 9.6% | 10.8% |
| Widowed | 10.9% | 8.7% | 5.6% |
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| Household Size | 2.35 | 2.59 | 2.60 |
| Households | 1,225 | 421 | 124,010,992 |
| Family Households | 788 | 299 | 80,755,759 |
| Married couple, w/children | 32.2% | 25.8% | 30.5% |
| Married couple, no children | 46.1% | 49.8% | 42.9% |
| Non Family Households | 437 | 122 | 43,255,233 |
| Single householder, w/children | 18.3% | 14.0% | 15.8% |
| Single householder, no children | 3.4% | 10.4% | 10.8% |