Near the old public square is Saint-Pierre Street, the main commercial street of Vieux-Terrebonne. In the early years of the village, it was called Saint-Louis Street, in honor of Saint-Louis-de-France, patron of the Terrebonne parish. In the twentieth century, there is still many merchants selling their products. It includes various businesses, such as the L.-H. Desjardins department store, a barber shop, drugstore, shoe store, the Jacques Solomon general store, a bakery, the Beausoleil grocery, and the J-B Gauthier hardware store, etc.
Today, Saint-Pierre Street remains an important commercial artery. Several well-established businesses have set up along it, such as Brûlerie de la Rivière, the Pub St-Patrick, the restaurant La Confrérie, Wow les Filles art gallery, the Da Pietro, restaurant Chez Fabien, and the Théâtre du Vieux-Terrebonne, to name a few.