Auch is surrounded by the following "communes", all of them part of the arrondissement of Auch: Roquelaure to the north, Preignan and Montaut-les-Créneaux to the northeast, Leboulin and Montégut to the east, Pessan to the southeast, Pavie to the south, Lasséran and Barran to the southwest, Ordan-Larroque and Duran to the west and Castin and Castillon-Massas to the northwest.