Markle, IN has a population of 1,209 and is the 13,980th largest city in the United States. The population density is 976 per sq mi which is 444% higher than the Indiana average and 978% higher than the national average. The median age in Markle is 40 which is approximately 7% higher than the Indiana average of 37. In Markle, 63% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 80% of Markle residents were born in Indiana, 19% were born out of state, 1% were born outside of the United States and 0% were foreign born.