St. Martinville is a somewhat small city located in the state of Louisiana. With a population of 5,302 people and six associated neighborhoods, St. Martinville is the 86th largest community in Louisiana.

The percentage of people in St. Martinville with college degrees is quite a bit lower than the national average for cities and towns of 21.84%: just 12.12% of people over 25 have a bachelor's degree or advanced degree.

The per capita income in St. Martinville in 2018 was $28,470, which is upper middle income relative to Louisiana, and lower middle income relative to the rest of the US. This equates to an annual income of $113,880 for a family of four. However, St. Martinville contains both very wealthy and poor people as well.

St. Martinville is an extremely ethnically-diverse city. The people who call St. Martinville home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of St. Martinville residents report their race to be Black or African-American, followed by White. Important ancestries of people in St. Martinville include French, French Canadian, German, Irish, and Italian.

The most common language spoken in St. Martinville is English. Other important languages spoken here include French and French Creole.