Louisiana, MO has a population of 3,299 and is the 8,333rd largest city in the United States. The population density is 1,053 per sq mi which is 1118% higher than the Missouri average and 1062% higher than the national average. The median age in Louisiana is 33 which is approximately 14% lower than the Missouri average of 38. In Louisiana, 55% of the population over 15 years of age are married, 95% speak English and 4% speak Spanish. 71% of Louisiana residents were born in Missouri, 24% were born out of state, 2% were born outside of the United States and 3% were foreign born.