| | Birch Tree, MO | Salem, MO | United States |
| Population | 447 | 4,623 | 329,725,481 |
| Female Population | 49.9% | 55.9% | 50.5% |
| Male Population | 50.1% | 44.2% | 49.5% |
| Median Age | 47.2 | 44.6 | 38.4 |
| space3 | | | |
| Population - 2010 | 680 | 4,954 | 309,327,143 |
| Population - 2000 | 634 | 4,854 | 285,036,114 |
| Population - 1990 | 599 | 4,486 | 251,960,433 |
| Pop. 2000 to Now | 2.8% | 0.4% | 15.6% |
| Pop. 1990 to Now | 8.9% | 8.7% | 30.8% |
| space4 | | | |
| Population Density | 323.7 | 1,456.1 | 93.4 |
| Land Area | 1.4 | 3.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Birch Tree, MO | Salem, MO | United States |
| Age 0 to 4 | 6.7% | 7.9% | 5.9% |
| Age 5 to 9 | 3.1% | 7.2% | 6.1% |
| Age 10 to 14 | 6.0% | 2.2% | 6.6% |
| Age 15 to 17 | 3.1% | 3.9% | 3.9% |
| Age 18 to 20 | 4.9% | 4.3% | 4.0% |
| Age 21 to 24 | 4.5% | 6.3% | 5.2% |
| Age 25 to 34 | 12.8% | 7.4% | 13.8% |
| Age 35 to 44 | 2.2% | 11.5% | 12.9% |
| Age 45 to 54 | 27.3% | 11.9% | 12.6% |
| Age 55 to 59 | 11.4% | 7.3% | 6.7% |
| Age 60 to 64 | 5.1% | 6.3% | 6.3% |
| Age 65 to 74 | 6.3% | 12.1% | 9.6% |
| Age 75 to 84 | 6.5% | 8.5% | 4.5% |
| Age 85 and over | 0.0% | 3.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Birch Tree, MO | Salem, MO | United States |
| White | 94.0% | 91.5% | 59.4% |
| Black | 0.0% | 0.4% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 6.0% | 5.8% | 3.2% |
| Hispanic | 0.0% | 2.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Birch Tree, MO | Salem, MO | United States |
| Married Population | 48.4% | 43.6% | 49.8% |
| Currently Married | 45.5% | 42.6% | 48.0% |
| Married but Separated | 2.9% | 0.9% | 1.8% |
| Single Population | 51.6% | 56.4% | 50.2% |
| Never Married | 8.5% | 23.2% | 33.8% |
| Divorced | 27.4% | 21.1% | 10.8% |
| Widowed | 15.7% | 12.2% | 5.6% |
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| Household Size | 2.10 | 2.09 | 2.60 |
| Households | 213 | 2,161 | 124,010,992 |
| Family Households | 98 | 1,150 | 80,755,759 |
| Married couple, w/children | 27.6% | 24.0% | 30.5% |
| Married couple, no children | 42.9% | 35.7% | 42.9% |
| Non Family Households | 115 | 1,011 | 43,255,233 |
| Single householder, w/children | 27.6% | 27.9% | 15.8% |
| Single householder, no children | 2.0% | 12.4% | 10.8% |