| | Afton, OK | Delhi, IA | United States |
| Population | 801 | 549 | 329,725,481 |
| Female Population | 57.3% | 55.0% | 50.5% |
| Male Population | 42.7% | 45.0% | 49.5% |
| Median Age | 37.5 | 51.5 | 38.4 |
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| Population - 2010 | 1,043 | 460 | 309,327,143 |
| Population - 2000 | 1,118 | 458 | 285,036,114 |
| Population - 1990 | 915 | 485 | 251,960,433 |
| Pop. 2000 to Now | -9.8% | 2.6% | 15.6% |
| Pop. 1990 to Now | 10.3% | -3.1% | 30.8% |
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| Population Density | 396.7 | 563.7 | 93.4 |
| Land Area | 2.0 | 1.0 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Afton, OK | Delhi, IA | United States |
| Age 0 to 4 | 7.7% | 5.1% | 5.9% |
| Age 5 to 9 | 8.2% | 8.0% | 6.1% |
| Age 10 to 14 | 8.5% | 2.7% | 6.6% |
| Age 15 to 17 | 1.4% | 2.4% | 3.9% |
| Age 18 to 20 | 2.0% | 1.1% | 4.0% |
| Age 21 to 24 | 4.2% | 2.6% | 5.2% |
| Age 25 to 34 | 14.9% | 13.1% | 13.8% |
| Age 35 to 44 | 14.4% | 9.5% | 12.9% |
| Age 45 to 54 | 9.2% | 11.8% | 12.6% |
| Age 55 to 59 | 6.5% | 8.2% | 6.7% |
| Age 60 to 64 | 6.6% | 12.8% | 6.3% |
| Age 65 to 74 | 6.0% | 14.4% | 9.6% |
| Age 75 to 84 | 9.7% | 4.9% | 4.5% |
| Age 85 and over | 0.6% | 3.5% | 1.9% |
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| Race | | | |
| | Afton, OK | Delhi, IA | United States |
| White | 65.5% | 99.5% | 59.4% |
| Black | 0.0% | 0.5% | 12.2% |
| Asian | 3.0% | 0.0% | 5.6% |
| Native American | 20.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 1.9% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 5.6% | 0.0% | 3.2% |
| Hispanic | 4.0% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Afton, OK | Delhi, IA | United States |
| Married Population | 54.1% | 58.9% | 49.8% |
| Currently Married | 52.1% | 57.4% | 48.0% |
| Married but Separated | 2.0% | 1.5% | 1.8% |
| Single Population | 46.0% | 41.1% | 50.2% |
| Never Married | 21.0% | 21.0% | 33.8% |
| Divorced | 11.1% | 10.6% | 10.8% |
| Widowed | 13.9% | 9.5% | 5.6% |
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| Household Size | 2.59 | 2.08 | 2.60 |
| Households | 309 | 264 | 124,010,992 |
| Family Households | 185 | 170 | 80,755,759 |
| Married couple, w/children | 22.7% | 14.7% | 30.5% |
| Married couple, no children | 47.6% | 62.9% | 42.9% |
| Non Family Households | 124 | 94 | 43,255,233 |
| Single householder, w/children | 20.5% | 19.4% | 15.8% |
| Single householder, no children | 9.2% | 2.9% | 10.8% |