| | Memphis, MO | Downing, MO | United States |
| Population | 1,773 | 461 | 329,725,481 |
| Female Population | 58.4% | 52.7% | 50.5% |
| Male Population | 41.6% | 47.3% | 49.5% |
| Median Age | 41.1 | 32 | 38.4 |
| space3 | | | |
| Population - 2010 | 1,812 | 336 | 309,327,143 |
| Population - 2000 | 2,061 | 396 | 285,036,114 |
| Population - 1990 | 2,094 | 359 | 251,960,433 |
| Pop. 2000 to Now | -11.9% | -13.9% | 15.6% |
| Pop. 1990 to Now | -13.3% | -5.0% | 30.8% |
| space4 | | | |
| Population Density | 1,138.0 | 699.5 | 93.4 |
| Land Area | 1.6 | 0.7 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Memphis, MO | Downing, MO | United States |
| Age 0 to 4 | 4.5% | 3.7% | 5.9% |
| Age 5 to 9 | 6.1% | 9.8% | 6.1% |
| Age 10 to 14 | 6.3% | 5.0% | 6.6% |
| Age 15 to 17 | 5.8% | 5.2% | 3.9% |
| Age 18 to 20 | 5.6% | 7.8% | 4.0% |
| Age 21 to 24 | 3.8% | 1.1% | 5.2% |
| Age 25 to 34 | 8.4% | 22.8% | 13.8% |
| Age 35 to 44 | 15.2% | 4.1% | 12.9% |
| Age 45 to 54 | 8.9% | 16.7% | 12.6% |
| Age 55 to 59 | 5.4% | 2.6% | 6.7% |
| Age 60 to 64 | 9.5% | 4.1% | 6.3% |
| Age 65 to 74 | 10.3% | 7.4% | 9.6% |
| Age 75 to 84 | 4.6% | 8.9% | 4.5% |
| Age 85 and over | 5.5% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Memphis, MO | Downing, MO | United States |
| White | 97.0% | 99.3% | 59.4% |
| Black | 0.1% | 0.0% | 12.2% |
| Asian | 0.0% | 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 | 2.9% | 0.7% | 3.2% |
| Hispanic | 0.0% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Memphis, MO | Downing, MO | United States |
| Married Population | 42.7% | 32.7% | 49.8% |
| Currently Married | 42.3% | 31.9% | 48.0% |
| Married but Separated | 0.4% | 0.8% | 1.8% |
| Single Population | 57.3% | 67.3% | 50.2% |
| Never Married | 30.0% | 41.5% | 33.8% |
| Divorced | 16.9% | 19.4% | 10.8% |
| Widowed | 10.4% | 6.4% | 5.6% |
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| Household Size | 2.32 | 3.57 | 2.60 |
| Households | 731 | 129 | 124,010,992 |
| Family Households | 382 | 58 | 80,755,759 |
| Married couple, w/children | 28.5% | 29.3% | 30.5% |
| Married couple, no children | 49.2% | 48.3% | 42.9% |
| Non Family Households | 349 | 71 | 43,255,233 |
| Single householder, w/children | 16.5% | 22.4% | 15.8% |
| Single householder, no children | 5.8% | 0.0% | 10.8% |