Fairmount, IN has a population of 2,908 and is the 8,964th largest city in the United States. The population density is 1,837 per sq mi which is 923% higher than the Indiana average and 1928% higher than the national average. The median age in Fairmount is 38 which is approximately 1% higher than the Indiana average of 37. In Fairmount, 57% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 78% of Fairmount residents were born in Indiana, 21% were born out of state, 0% were born outside of the United States and 1% were foreign born.