| | Seiling, OK | Arapaho, OK | United States |
| Population | 912 | 911 | 329,725,481 |
| Female Population | 63.3% | 56.3% | 50.5% |
| Male Population | 36.7% | 43.7% | 49.5% |
| Median Age | 35.5 | 38.9 | 38.4 |
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| Population - 2010 | 851 | 797 | 309,327,143 |
| Population - 2000 | 875 | 748 | 285,036,114 |
| Population - 1990 | 1,031 | 802 | 251,960,433 |
| Pop. 2000 to Now | -4.1% | 5.4% | 15.6% |
| Pop. 1990 to Now | -18.6% | -1.8% | 30.8% |
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| Population Density | 895.0 | 1,303.3 | 93.4 |
| Land Area | 1.0 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Seiling, OK | Arapaho, OK | United States |
| Age 0 to 4 | 3.9% | 7.1% | 5.9% |
| Age 5 to 9 | 4.5% | 7.4% | 6.1% |
| Age 10 to 14 | 18.2% | 12.2% | 6.6% |
| Age 15 to 17 | 8.4% | 0.1% | 3.9% |
| Age 18 to 20 | 8.3% | 1.4% | 4.0% |
| Age 21 to 24 | 2.1% | 3.1% | 5.2% |
| Age 25 to 34 | 3.1% | 11.2% | 13.8% |
| Age 35 to 44 | 17.7% | 20.0% | 12.9% |
| Age 45 to 54 | 7.1% | 18.1% | 12.6% |
| Age 55 to 59 | 4.8% | 7.7% | 6.7% |
| Age 60 to 64 | 4.3% | 1.9% | 6.3% |
| Age 65 to 74 | 10.7% | 8.9% | 9.6% |
| Age 75 to 84 | 3.9% | 1.0% | 4.5% |
| Age 85 and over | 2.9% | 0.0% | 1.9% |
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| Race | | | |
| | Seiling, OK | Arapaho, OK | United States |
| White | 69.3% | 65.5% | 59.4% |
| Black | 0.0% | 0.9% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 9.2% | 11.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 8.9% | 5.4% | 3.2% |
| Hispanic | 12.6% | 17.2% | 18.4% |
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| Marriage & Family | | | |
| | Seiling, OK | Arapaho, OK | United States |
| Married Population | 48.9% | 53.4% | 49.8% |
| Currently Married | 48.9% | 50.2% | 48.0% |
| Married but Separated | 0.0% | 3.3% | 1.8% |
| Single Population | 51.1% | 46.6% | 50.2% |
| Never Married | 35.7% | 35.8% | 33.8% |
| Divorced | 8.7% | 9.4% | 10.8% |
| Widowed | 6.7% | 1.3% | 5.6% |
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| Household Size | 3.36 | 3.59 | 2.60 |
| Households | 265 | 234 | 124,010,992 |
| Family Households | 205 | 162 | 80,755,759 |
| Married couple, w/children | 44.4% | 38.3% | 30.5% |
| Married couple, no children | 31.2% | 46.9% | 42.9% |
| Non Family Households | 60 | 72 | 43,255,233 |
| Single householder, w/children | 23.9% | 11.1% | 15.8% |
| Single householder, no children | 0.5% | 3.7% | 10.8% |