The canton of Plaine de l'Agoût is an administrative division of the Tarn department, southern France. It was created at the French canton reorganisation which came into effect in March 2015. Its seat is in Sémalens.
It consists of the following communes:
Brousse Cabanès Carbes Cuq Damiatte Fiac Fréjeville Jonquières Laboulbène Guitalens-L'Albarède Lautrec Magrin Montdragon Montpinier Peyregoux Prades Pratviel Puycalvel Saint-Genest-de-Contest Saint-Julien-du-Puy Saint-Paul-Cap-de-Joux Sémalens Serviès Teyssode Vénès Vielmur-sur-Agout Viterbe
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