Columbia, TN has a population of 36,130 and is the 1,164th largest city in the United States. The population density is 1,133 per sq mi which is 640% higher than the Tennessee average and 1151% higher than the national average. The median age in Columbia is 37 which is approximately 5% lower than the Tennessee average of 39. In Columbia, 51% of the population over 15 years of age are married, 92% speak English and 7% speak Spanish. 62% of Columbia residents were born in Tennessee, 33% were born out of state, 0% were born outside of the United States and 5% were foreign born.