Louisiana has 64 parishes (a Parish being Louisiana's equivalent to a County in most other states) and 7 congressional districts: 58 parishes are wholly within a given congressional district; 6 parishes are divided among more than one congressional district.
UNDIVIDED PARISHES (those wholly within one Congressional District):
- CD # 1: St. Tammany, Tangipahoa and Washington
- CD # 3: Assumption, Iberia, Lafourche, Plaquemines, St. Bernard, St. Charles, St. James, St. John the Baptist, St. Mary and Terrebonne
- CD # 4: Beauregard, Bienville, Bossier, Caddo, Claiborne, DeSoto, Natchitoches, Red River, Sabine, Vernon and Webster
- CD # 5: Avoyelles, Caldwell, Catahoula, Concordia, East Carroll, Franklin, Grant, Jackson, LaSalle, Lincoln, Madison, Morehouse, Ouachita, Rapides, Richland, Tensas, Union, West Carroll and Winn
- CD # 6: East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee, St. Helena, West Baton Rouge and West Feliciana
- CD # 7: Acadia, Calcasieu, Cameron, Jefferson Davis, Lafayette, St. Landry and Vermilion
DIVIDED PARISHES (those split between more than one Congressional District):
- Allen: CDs 4 & 7
- Ascension: CDs 3 & 6
- Evangeline: CDs 5 & 7
- Jefferson: CDs 1, 2 & 3
- Orleans (coterminous with the City of New Orleans): CDs 1 & 2
- St. Martin: CDs 3 & 7
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