St. Martinville is a city located in Louisiana. With a 2020 population of 5,879, it is the 56th largest city in Louisiana and the 4333rd largest city in the United States. St. Martinville is currently declining at a rate of -0.20% annually and its population has decreased by -3.84% since the most recent census, which recorded a population of 6,114 in 2010. St. Martinville reached it's highest population of 7,965 in 1980. Spanning over 3 miles, St. Martinville has a population density of 1,902 people per square mile.
The average household income in St. Martinville is $44,156 with a poverty rate of 27.49%. The median rental costs in recent years comes to $583 per month, and the median house value is $89,800. The median age in St. Martinville is 37.6 years, 33.9 years for males, and 46.6 years for females. For every 100 females there are 86.1 males.