Louisiana Highway 76 leads south from Maringouin 7 miles (11 km) along Bayou Maringuoin to Interstate 10 at Ramah.

According to the United States Census Bureau, Maringuoin has a total area of 0.73 square miles (1.9 km2), all of it recorded as land.

As of the 2020 United States census, there were 891 people, 393 households, and 248 families residing in the town.

At the 2000 United States census,[9] there were 1,262 people, 421 households, and 327 families residing in the town.

In 1838, the Maryland Province of the Society of Jesus agreed to sell 272 slaves they owned to Southern buyers.

One of the Maryland Jesuits' institutions, Georgetown University, formed a working group to study the sale and ultimately extended to the descendants of the Jesuits' slaves the "same consideration [they] give members of the Georgetown community in the admissions process".