Lafayette, TN has a population of 4,909 and is the 6,553rd largest city in the United States. The population density is 939 per sq mi which is 513% higher than the Tennessee average and 936% higher than the national average. The median age in Lafayette is 41 which is approximately 6% higher than the Tennessee average of 39. In Lafayette, 64% of the population over 15 years of age are married, 98% speak English and 2% speak Spanish. 79% of Lafayette residents were born in Tennessee, 19% were born out of state, 0% were born outside of the United States and 2% were foreign born.