Collierville, TN has a population of 48,005 and is the 859th largest city in the United States. The population density is 1,332 per sq mi which is 770% higher than the Tennessee average and 1371% higher than the national average. The median age in Collierville is 40 which is approximately 4% higher than the Tennessee average of 39. In Collierville, 69% of the population over 15 years of age are married, 90% speak English and 2% speak Spanish. 49% of Collierville residents were born in Tennessee, 43% were born out of state, 1% were born outside of the United States and 7% were foreign born.