Shackle Island, TN has a population of 3,290 and is the 8,344th largest city in the United States. The population density is 592 per sq mi which is 287% higher than the Tennessee average and 554% higher than the national average. The median age in Shackle Island is 43 which is approximately 13% higher than the Tennessee average of 39. In Shackle Island, 68% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 57% of Shackle Island residents were born in Tennessee, 39% were born out of state, 1% were born outside of the United States and 2% were foreign born.