Springfield, TN has a population of 16,650 and is the 2,568th largest city in the United States. The population density is 1,235 per sq mi which is 707% higher than the Tennessee average and 1264% higher than the national average. The median age in Springfield is 35 which is approximately 8% lower than the Tennessee average of 39. In Springfield, 52% of the population over 15 years of age are married, 88% speak English and 11% speak Spanish. 66% of Springfield residents were born in Tennessee, 25% were born out of state, 2% were born outside of the United States and 7% were foreign born.