Lafayette, LA has a population of 125,808 and is the 222nd largest city in the United States. The population density is 2,280 per sq mi which is 2470% higher than the Louisiana average and 2416% higher than the national average. The median age in Lafayette is 34 which is approximately 6% lower than the Louisiana average of 36. In Lafayette, 45% of the population over 15 years of age are married, 88% speak English and 4% speak Spanish. 78% of Lafayette residents were born in Louisiana, 16% were born out of state, 1% were born outside of the United States and 5% were foreign born.