New Haven, IN has a population of 15,677 and is the 2,736th largest city in the United States. The population density is 1,567 per sq mi which is 773% higher than the Indiana average and 1630% higher than the national average. The median age in New Haven is 37 which is approximately 2% lower than the Indiana average of 37. In New Haven, 57% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 78% of New Haven residents were born in Indiana, 20% were born out of state, 1% were born outside of the United States and 1% were foreign born.