Assumption Parish


Assumption Parish was established on March 31, 1807 as one of the 19 original Louisiana civil parishes.  Today its land area covers approximately 339 square miles. The parish is bounded by Terrebonne and St. Mary Parishes on the south, Iberia and St. Martin Parishes on the west, Iberville and Ascension Parishes to the north, and St. James and Lafourche Parishes on the east.  It is bisected by Bayou Lafourche, which was at one time a major distributary of the Mississippi River, but was dammed off from the river in 1903 to prevent flooding.  The Parish was named for the Festival of the Assumption of the Blessed Virgin Mary. While the parish is located in the Barataria-Terrebonne National Estuary region, it also borders the Atchafalaya Basin.

Parish Websites

Assumption Parish Police Jury
Assumption Parish Schools
Assumption Parish Chamber of Commerce
Barataria Terrebone National Estuary Program
Atchafalaya Basin
South Louisiana Economic Council

Population, 2010:                              23,352

Population Estimate, 2019:              21,891

County Seat:                                      Napoleonville

 Incorporated Municipalities 

Municipality 2018 Estimated Population
Village of Napoleonville 662

Assumption has a number of unincorporated communities that are Census Designated Places (CDPs)

CDP 2018 Estimated Population CDP 2017 Estimated Population
Bayou L’Ourse 1,564 Paincourtville 909
Belle Rose 1,846 Pierre Part 2,319
Labadieville 2,092 Supreme 984

For more demographic data on Assumption Parish, visit

Updated May 2020

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