Trilla is a commune in the Pyrénées-Orientales department in southern France. Its inhabitants are called Trillanais, or Trilhanols in Occitan. T…Trilla is a commune in the Pyrénées-Orientales department in southern France. Its inhabitants are called Trillanais, or Trilhanols in Occitan. Trilla is located in the canton of La Vallée de l'Agly and in the arrondissement of Prades.