Mamou, LA has a population of 3,203 and is the 8,475th largest city in the United States. The population density is 2,273 per sq mi which is 2463% higher than the Louisiana average and 2409% higher than the national average. The median age in Mamou is 25 which is approximately 30% lower than the Louisiana average of 36. In Mamou, 45% of the population over 15 years of age are married, 85% speak English and 0% speak Spanish. 95% of Mamou residents were born in Louisiana, 5% were born out of state, 0% were born outside of the United States and 0% were foreign born.