| | Salem, IN | Missouri, ND | United States |
| Population | 6,276 | 222 | 329,725,481 |
| Female Population | 52.1% | 31.5% | 50.5% |
| Male Population | 47.9% | 68.5% | 49.5% |
| Median Age | 37.9 | 45.5 | 38.4 |
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| Population - 2010 | 6,323 | 168 | 309,327,143 |
| Population - 2000 | 6,172 | 132 | 285,036,114 |
| Population - 1990 | 5,619 | 86 | 251,960,433 |
| Pop. 2000 to Now | 1.0% | 39.4% | 15.6% |
| Pop. 1990 to Now | 11.0% | 114.0% | 30.8% |
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| Population Density | 1,569.0 | 9.4 | 93.4 |
| Land Area | 4.0 | 23.6 | 3,531,905.4 |
| Water Area | 0.0 | 5.7 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Salem, IN | Missouri, ND | United States |
| Age 0 to 4 | 6.5% | 3.2% | 5.9% |
| Age 5 to 9 | 5.7% | 4.5% | 6.1% |
| Age 10 to 14 | 6.7% | 3.6% | 6.6% |
| Age 15 to 17 | 3.0% | 10.8% | 3.9% |
| Age 18 to 20 | 1.6% | 4.5% | 4.0% |
| Age 21 to 24 | 7.8% | 0.9% | 5.2% |
| Age 25 to 34 | 13.7% | 18.9% | 13.8% |
| Age 35 to 44 | 11.6% | 3.2% | 12.9% |
| Age 45 to 54 | 9.1% | 14.0% | 12.6% |
| Age 55 to 59 | 10.2% | 4.5% | 6.7% |
| Age 60 to 64 | 5.1% | 26.1% | 6.3% |
| Age 65 to 74 | 9.1% | 5.0% | 9.6% |
| Age 75 to 84 | 6.6% | 0.5% | 4.5% |
| Age 85 and over | 3.2% | 0.5% | 1.9% |
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| Race | | | |
| | Salem, IN | Missouri, ND | United States |
| White | 95.3% | 68.0% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.1% | 0.0% | 5.6% |
| Native American | 0.0% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.5% | 31.5% | 3.2% |
| Hispanic | 2.1% | 0.0% | 18.4% |
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| Marriage & Family | | | |
| | Salem, IN | Missouri, ND | United States |
| Married Population | 41.6% | 60.4% | 49.8% |
| Currently Married | 40.2% | 60.4% | 48.0% |
| Married but Separated | 1.4% | 0.0% | 1.8% |
| Single Population | 58.4% | 39.6% | 50.2% |
| Never Married | 31.5% | 35.5% | 33.8% |
| Divorced | 18.5% | 0.5% | 10.8% |
| Widowed | 8.4% | 3.6% | 5.6% |
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| Household Size | 2.45 | 2.78 | 2.60 |
| Households | 2,485 | 80 | 124,010,992 |
| Family Households | 1,448 | 68 | 80,755,759 |
| Married couple, w/children | 27.6% | 55.9% | 30.5% |
| Married couple, no children | 39.4% | 33.8% | 42.9% |
| Non Family Households | 1,037 | 12 | 43,255,233 |
| Single householder, w/children | 22.2% | 4.4% | 15.8% |
| Single householder, no children | 10.8% | 5.9% | 10.8% |