Frankton, IN has a population of 1,819 and is the 11,578th largest city in the United States. The population density is 1,712 per sq mi which is 854% higher than the Indiana average and 1790% higher than the national average. The median age in Frankton is 38 which is approximately equal to the Indiana average of 37. In Frankton, 58% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 87% of Frankton residents were born in Indiana, 12% were born out of state, 0% were born outside of the United States and 1% were foreign born.