| | Pocahontas, IA | Memphis, MO | United States |
| Population | 1,465 | 1,773 | 329,725,481 |
| Female Population | 55.8% | 58.4% | 50.5% |
| Male Population | 44.2% | 41.6% | 49.5% |
| Median Age | 54.2 | 41.1 | 38.4 |
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| Population - 2010 | 1,789 | 1,812 | 309,327,143 |
| Population - 2000 | 1,970 | 2,061 | 285,036,114 |
| Population - 1990 | 2,085 | 2,094 | 251,960,433 |
| Pop. 2000 to Now | -17.3% | -11.9% | 15.6% |
| Pop. 1990 to Now | -21.8% | -13.3% | 30.8% |
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| Population Density | 726.3 | 1,138.0 | 93.4 |
| Land Area | 2.0 | 1.6 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Pocahontas, IA | Memphis, MO | United States |
| Age 0 to 4 | 5.3% | 4.5% | 5.9% |
| Age 5 to 9 | 5.3% | 6.1% | 6.1% |
| Age 10 to 14 | 6.1% | 6.3% | 6.6% |
| Age 15 to 17 | 3.1% | 5.8% | 3.9% |
| Age 18 to 20 | 3.6% | 5.6% | 4.0% |
| Age 21 to 24 | 2.0% | 3.8% | 5.2% |
| Age 25 to 34 | 10.7% | 8.4% | 13.8% |
| Age 35 to 44 | 4.4% | 15.2% | 12.9% |
| Age 45 to 54 | 11.5% | 8.9% | 12.6% |
| Age 55 to 59 | 10.4% | 5.4% | 6.7% |
| Age 60 to 64 | 11.8% | 9.5% | 6.3% |
| Age 65 to 74 | 10.9% | 10.3% | 9.6% |
| Age 75 to 84 | 13.0% | 4.6% | 4.5% |
| Age 85 and over | 1.8% | 5.5% | 1.9% |
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| Race | | | |
| | Pocahontas, IA | Memphis, MO | United States |
| White | 96.2% | 97.0% | 59.4% |
| Black | 0.2% | 0.1% | 12.2% |
| Asian | 2.3% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.6% | 2.9% | 3.2% |
| Hispanic | 0.7% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Pocahontas, IA | Memphis, MO | United States |
| Married Population | 48.6% | 42.7% | 49.8% |
| Currently Married | 47.0% | 42.3% | 48.0% |
| Married but Separated | 1.6% | 0.4% | 1.8% |
| Single Population | 51.4% | 57.3% | 50.2% |
| Never Married | 19.6% | 30.0% | 33.8% |
| Divorced | 20.5% | 16.9% | 10.8% |
| Widowed | 11.4% | 10.4% | 5.6% |
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| Household Size | 2.06 | 2.32 | 2.60 |
| Households | 691 | 731 | 124,010,992 |
| Family Households | 316 | 382 | 80,755,759 |
| Married couple, w/children | 25.3% | 28.5% | 30.5% |
| Married couple, no children | 58.9% | 49.2% | 42.9% |
| Non Family Households | 375 | 349 | 43,255,233 |
| Single householder, w/children | 13.6% | 16.5% | 15.8% |
| Single householder, no children | 2.2% | 5.8% | 10.8% |