Mamou is a town in Evangeline Parish, Louisiana, United States. The population was 3,242 at the 2010 census, down from 3,566 in 2000. Mamou is located in south-central Evangeline Parish. Louisiana Highway 13 follows the western border of the town, leading north 3 miles to Reddell and south 10 miles to Eunice. Ville Platte, the parish seat, is 12 mileā¦Mamou is a town in Evangeline Parish, Louisiana, United States. The population was 3,242 at the 2010 census, down from 3,566 in 2000. Mamou is located in south-central Evangeline Parish. Louisiana Highway 13 follows the western border of the town, leading north 3 miles to Reddell and south 10 miles to Eunice. Ville Platte, the parish seat, is 12 miles to the northeast.