Signal Mountain, TN has a population of 8,500 and is the 4,461st largest city in the United States. The population density is 1,015 per sq mi which is 563% higher than the Tennessee average and 1021% higher than the national average. The median age in Signal Mountain is 43 which is approximately 12% higher than the Tennessee average of 39. In Signal Mountain, 72% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 48% of Signal Mountain residents were born in Tennessee, 48% were born out of state, 1% were born outside of the United States and 2% were foreign born.