The "commune" of Gap is surrounded by 17 "communes": Laye, Saint-Laurent-du-Cros, Forest-Saint-Julien, La Rochette, Rambaud, Jarjayes, Neffes, Châteauvieux, Lettret, Pelleautier, La Roche-des-Arnauds, La Freissinouse, La Fare-en-Champsaur, Poligny, Le Noyer, Le Dévoluy, Rabou