Birch Tree, MO has a population of 534 and is the 19,157th largest city in the United States. The population density is 387 per sq mi which is 348% higher than the Missouri average and 327% higher than the national average. The median age in Birch Tree is 44 which is approximately 16% higher than the Missouri average of 38. In Birch Tree, 59% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 57% of Birch Tree residents were born in Missouri, 43% were born out of state, 0% were born outside of the United States and 0% were foreign born.