Shelbyville, TN has a population of 20,916 and is the 2,071st largest city in the United States. The population density is 1,134 per sq mi which is 641% higher than the Tennessee average and 1152% higher than the national average. The median age in Shelbyville is 35 which is approximately 10% lower than the Tennessee average of 39. In Shelbyville, 56% of the population over 15 years of age are married, 77% speak English and 21% speak Spanish. 60% of Shelbyville residents were born in Tennessee, 26% were born out of state, 0% were born outside of the United States and 13% were foreign born.