Grand Coteau is a city located in St. Landry Parish Louisiana. With a 2020 population of 889, it is the 178th largest city in Louisiana and the 10804th largest city in the United States . Grand Coteau is currently declining at a rate of -0.89% annually and its population has decreased by -6.12% since the most recent census, which recorded a population of 947 in 2010. Grand Coteau reached it's highest population of in . Spanning over 2 miles, Grand Coteau has a population density of 367 people per square mile.
The average household income in Grand Coteau is $46,013 with a poverty rate of 32.89%. The median rental costs in recent years comes to $636 per month, and the median house value is $97,500. The median age in Grand Coteau is 36.9 years, 30.4 years for males, and 44.2 years for females.