Township which is Lorris est prefecture consists of thirteen municipalites :

• including whether located in the basin of the Loire :
  • Vieilles-Maisons sur Joudry,
    
  • The other twelve are in the basin ot the Seine :
    • Chailly,
      
    • Coudroy,
      
    • La Cour-Marigny,
      
    • Lorris,
      
    • Montereau,
      
    • Noyers,
      
    • Oussoy-en-Gâtinais,
      
    • Ouzouer des Champs,
      
    • Presnoy,
      
    • St Hilaire sur Puiseaux,
      
    • Thimory,
    • Varennes-Changy.
• The point of the watershed is in Grignon in the town of de Vieilles-Maisons sur Joudry.
• The area of the township is 26,809 acres and the cantonal population is 9,893 people.