Castelnaudary
View from the Canal du Midi
Administration
Country	France
Region	Languedoc-Roussillon
Department	Aude
Arrondissement	Carcassonne
Intercommunality	Castelnaudary et Bassin lauraguais
Mayor	Patrick Maugard (PS) (2014–2020)
Statistics
Elevation	145–215 m (476–705 ft) (avg. 165 m/541 ft)
Land area1	47.72 km2 (18.42 sq mi)
Population2	11,748  (2012)
- Density	246/km2 (640/sq mi)
INSEE/Postal code	11076/ 11400
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km² (0.386 sq mi or 247 acres) and river estuaries.
2Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once.

Castelnaudary (Occitan: Castèlnòu d'Arri) is a commune in the Aude department in the Languedoc-Roussillon region in southern France.

A campus of the École nationale de l'aviation civile (French civil aviation university) is located at Castelnaudary.

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