The state of Louisiana is divided into 64 counties. Ascension Parish is the oldest (founded in 1807), while Allen Parish is the youngest (established in 1912).

East Baton Rouge Parish is the most populous, with a population of 440,171. Plaquemines Parish (6,291 km2) has the largest land area, while West Baton Rouge Parish has the smallest (526 km2).

Please find a list of all Louisiana counties sorted alphabetically below.

• Acadia Parish, LA
• Allen Parish, LA
• Ascension Parish, LA
• Assumption Parish, LA
• Avoyelles Parish, LA
• Beauregard Parish, LA
• Bienville Parish, LA
• Bossier Parish, LA
• Caddo Parish, LA
• Calcasieu Parish, LA
• Caldwell Parish, LA
• Cameron Parish, LA
• Catahoula Parish, LA
• Claiborne Parish, LA
• Concordia Parish, LA
• De Soto Parish, LA
• East Baton Rouge Parish, LA
• East Carroll Parish, LA
• East Feliciana Parish, LA
• Evangeline Parish, LA
• Franklin Parish, LA
• Grant Parish, LA
• Iberia Parish, LA
• Iberville Parish, LA
• Jackson Parish, LA
• Jefferson Davis Parish, LA
• Jefferson Parish, LA
• La Salle Parish, LA
• Lafayette Parish, LA
• Lafourche Parish, LA
• Lincoln Parish, LA
• Livingston Parish, LA
• Madison Parish, LA
• Morehouse Parish, LA
• Natchitoches Parish, LA
• Orleans Parish, LA
• Ouachita Parish, LA
• Plaquemines Parish, LA
• Pointe Coupee Parish, LA
• Rapides Parish, LA
• Red River Parish, LA
• Richland Parish, LA
• Sabine Parish, LA
• Saint Bernard Parish, LA
• Saint Charles Parish, LA
• Saint Helena Parish, LA
• Saint James Parish, LA
• Saint John the Baptist Parish, LA
• Saint Landry Parish, LA
• Saint Martin Parish, LA
• Saint Mary Parish, LA
• Saint Tammany Parish, LA
• Tangipahoa Parish, LA
• Tensas Parish, LA
• Terrebonne Parish, LA
• Union Parish, LA
• Vermillion Parish, LA
• Vernon Parish, LA
• Washington Parish, LA
• Webster Parish, LA
• West Baton Rouge Parish, LA
• West Carroll Parish, LA
• West Feliciana Parish, LA
• Winn Parish, LA