Franklin, IN has a population of 24,021 and is the 1,813th largest city in the United States. The population density is 1,824 per sq mi which is 916% higher than the Indiana average and 1914% higher than the national average. The median age in Franklin is 38 which is approximately 3% higher than the Indiana average of 37. In Franklin, 58% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 74% of Franklin residents were born in Indiana, 23% were born out of state, 1% were born outside of the United States and 2% were foreign born.