Louiseville is a town in the Mauricie region of the province of Quebec in Canada. It is located near the mouth of the 'Rivière-du-Loup', on the …Louiseville is a town in the Mauricie region of the province of Quebec in Canada. It is located near the mouth of the 'Rivière-du-Loup', on the north shore of Lac Saint-Pierre. Louiseville is twinned with Soissons in France and Cerfontaine in Belgium.