Columbia, LA has a population of 478 and is the 19,816th largest city in the United States. The population density is 631 per sq mi which is 612% higher than the Louisiana average and 597% higher than the national average. The median age in Columbia is 43 which is approximately 19% higher than the Louisiana average of 36. In Columbia, 48% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 81% of Columbia residents were born in Louisiana, 18% were born out of state, 0% were born outside of the United States and 1% were foreign born.