Elmer, MO has a population of 84 and is the 27,313th largest city in the United States. The population density is 332 per sq mi which is 284% higher than the Missouri average and 266% higher than the national average. The median age in Elmer is 40 which is approximately 4% higher than the Missouri average of 38. In Elmer, 81% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 93% of Elmer residents were born in Missouri, 7% were born out of state, 0% were born outside of the United States and 0% were foreign born.