Mount Auburn, IN has a population of 123 and is the 26,308th largest city in the United States. The population density is 647 per sq mi which is 261% higher than the Indiana average and 614% higher than the national average. The median age in Mount Auburn is 33 which is approximately 12% lower than the Indiana average of 37. In Mount Auburn, 51% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 80% of Mount Auburn residents were born in Indiana, 20% were born out of state, 0% were born outside of the United States and 0% were foreign born.