New Middletown, IN has a population of 31 and is the 28,585th largest city in the United States. The population density is 754 per sq mi which is 320% higher than the Indiana average and 732% higher than the national average. The median age in New Middletown is 54 which is approximately 45% higher than the Indiana average of 37. In New Middletown, 77% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 77% of New Middletown residents were born in Indiana, 23% were born out of state, 0% were born outside of the United States and 0% were foreign born.