| | Memphis, IN | Sellersburg, IN | United States |
| Population | 790 | 9,686 | 329,725,481 |
| Female Population | 48.0% | 53.8% | 50.5% |
| Male Population | 52.0% | 46.2% | 49.5% |
| Median Age | 33.4 | 41.1 | 38.4 |
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| Population - 2010 | 420 | 8,349 | 309,327,143 |
| Population - 2000 | 400 | 6,071 | 285,036,114 |
| Population - 1990 | 261 | 5,745 | 251,960,433 |
| Pop. 2000 to Now | 144.3% | 49.0% | 15.6% |
| Pop. 1990 to Now | 274.3% | 57.5% | 30.8% |
| space4 | | | |
| Population Density | 304.1 | 1,319.4 | 93.4 |
| Land Area | 2.6 | 7.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Memphis, IN | Sellersburg, IN | United States |
| Age 0 to 4 | 11.5% | 6.6% | 5.9% |
| Age 5 to 9 | 8.0% | 6.8% | 6.1% |
| Age 10 to 14 | 4.9% | 5.9% | 6.6% |
| Age 15 to 17 | 1.9% | 4.1% | 3.9% |
| Age 18 to 20 | 0.0% | 4.2% | 4.0% |
| Age 21 to 24 | 2.8% | 2.6% | 5.2% |
| Age 25 to 34 | 27.8% | 11.3% | 13.8% |
| Age 35 to 44 | 13.8% | 14.9% | 12.9% |
| Age 45 to 54 | 11.0% | 10.5% | 12.6% |
| Age 55 to 59 | 10.6% | 9.2% | 6.7% |
| Age 60 to 64 | 1.4% | 5.9% | 6.3% |
| Age 65 to 74 | 1.6% | 11.1% | 9.6% |
| Age 75 to 84 | 4.6% | 4.9% | 4.5% |
| Age 85 and over | 0.0% | 1.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Memphis, IN | Sellersburg, IN | United States |
| White | 100.0% | 88.2% | 59.4% |
| Black | 0.0% | 2.3% | 12.2% |
| Asian | 0.0% | 0.7% | 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 | 0.0% | 4.7% | 3.2% |
| Hispanic | 0.0% | 4.2% | 18.4% |
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| Marriage & Family | | | |
| | Memphis, IN | Sellersburg, IN | United States |
| Married Population | 80.2% | 55.2% | 49.8% |
| Currently Married | 80.2% | 52.3% | 48.0% |
| Married but Separated | 0.0% | 3.0% | 1.8% |
| Single Population | 19.8% | 44.8% | 50.2% |
| Never Married | 19.8% | 26.6% | 33.8% |
| Divorced | 0.0% | 11.6% | 10.8% |
| Widowed | 0.0% | 6.6% | 5.6% |
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| Household Size | 2.60 | 2.67 | 2.60 |
| Households | 304 | 3,599 | 124,010,992 |
| Family Households | 282 | 2,430 | 80,755,759 |
| Married couple, w/children | 34.8% | 34.0% | 30.5% |
| Married couple, no children | 51.8% | 45.4% | 42.9% |
| Non Family Households | 22 | 1,169 | 43,255,233 |
| Single householder, w/children | 8.5% | 14.6% | 15.8% |
| Single householder, no children | 5.0% | 6.0% | 10.8% |