Indianapolis, IN has a population of 846,674 and is the 14th largest city in the United States. The population density is 2,342 per sq mi which is 1205% higher than the Indiana average and 2485% higher than the national average. The median age in Indianapolis is 34 which is approximately 9% lower than the Indiana average of 37. In Indianapolis, 45% of the population over 15 years of age are married, 87% speak English and 9% speak Spanish. 67% of Indianapolis residents were born in Indiana, 24% were born out of state, 1% were born outside of the United States and 9% were foreign born.