Pierre Part (French: Ville de Pierre Part) is a census-designated place (CDP) in Assumption Parish, Louisiana, United States. The population was 3,169 at the 2010 census, making it the most populous community in Assumption Parish. With 39.3 percent of the population speaking French at home, Pierre Part is the most French town in the United States (by percentage) outside of Maine. Pierre Part is known locally for its prominent French influence and ancestry, which have become significant aspects of its contemporary local culture. Situated near Lake Verret, Pierre Part is a popular local destination for water sports and fishing during the summer.
Pierre Part was founded by Acadian French settlers after the Great Upheaval of 1755, during which much of the French population of Acadia was expelled by its British conquerors. The town remained isolated from most of the world, since it was surrounded by water and was inaccessible by land until the mid-twentieth century. Before the Great Depression, the inhabitants of Pierre Part were fishermen; after the Depression, many men of the town were forced to find work in other fields including logging, levee building, and the growing petroleum industry in Louisiana. Fewer people continue the traditional ways of fishing and living off the land with each generation.
Pierre Part experienced flooding when the Morganza Spillway was opened during the 1973 Mississippi River flooding.
The people of Pierre Part are predominantly of French ancestry, of families who either came directly from France or those whose came from Canada (Acadia), and before that, France.