| | Clayton, OK | Folsom, NM | United States |
| Population | 639 | 71 | 329,725,481 |
| Female Population | 46.3% | 45.1% | 50.5% |
| Male Population | 53.7% | 54.9% | 49.5% |
| Median Age | 35.4 | 34.2 | 38.4 |
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| Population - 2010 | 824 | 61 | 309,327,143 |
| Population - 2000 | 719 | 75 | 285,036,114 |
| Population - 1990 | 636 | 71 | 251,960,433 |
| Pop. 2000 to Now | 7.9% | -29.3% | 15.6% |
| Pop. 1990 to Now | 22.0% | -25.4% | 30.8% |
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| Population Density | 372.2 | 131.7 | 93.4 |
| Land Area | 1.7 | 0.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Clayton, OK | Folsom, NM | United States |
| Age 0 to 4 | 9.5% | 21.1% | 5.9% |
| Age 5 to 9 | 4.9% | 22.5% | 6.1% |
| Age 10 to 14 | 3.0% | 0.0% | 6.6% |
| Age 15 to 17 | 6.1% | 0.0% | 3.9% |
| Age 18 to 20 | 5.6% | 0.0% | 4.0% |
| Age 21 to 24 | 2.0% | 0.0% | 5.2% |
| Age 25 to 34 | 18.2% | 16.9% | 13.8% |
| Age 35 to 44 | 8.8% | 22.5% | 12.9% |
| Age 45 to 54 | 10.3% | 0.0% | 12.6% |
| Age 55 to 59 | 5.9% | 2.8% | 6.7% |
| Age 60 to 64 | 5.0% | 7.0% | 6.3% |
| Age 65 to 74 | 13.0% | 4.2% | 9.6% |
| Age 75 to 84 | 7.0% | 2.8% | 4.5% |
| Age 85 and over | 0.6% | 0.0% | 1.9% |
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| Race | | | |
| | Clayton, OK | Folsom, NM | United States |
| White | 56.3% | 97.2% | 59.4% |
| Black | 1.6% | 0.0% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 18.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 1.1% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 19.1% | 0.0% | 3.2% |
| Hispanic | 3.9% | 2.8% | 18.4% |
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| Marriage & Family | | | |
| | Clayton, OK | Folsom, NM | United States |
| Married Population | 35.4% | 95.0% | 49.8% |
| Currently Married | 31.1% | 95.0% | 48.0% |
| Married but Separated | 4.4% | 0.0% | 1.8% |
| Single Population | 64.6% | 5.0% | 50.2% |
| Never Married | 33.3% | 0.0% | 33.8% |
| Divorced | 23.3% | 5.0% | 10.8% |
| Widowed | 8.0% | 0.0% | 5.6% |
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| Household Size | 2.27 | 5.92 | 2.60 |
| Households | 282 | 12 | 124,010,992 |
| Family Households | 119 | 10 | 80,755,759 |
| Married couple, w/children | 24.4% | 40.0% | 30.5% |
| Married couple, no children | 31.9% | 60.0% | 42.9% |
| Non Family Households | 163 | 2 | 43,255,233 |
| Single householder, w/children | 32.8% | 0.0% | 15.8% |
| Single householder, no children | 10.9% | 0.0% | 10.8% |