The "commune" of Saint-Dizier is surrounded by the "communes" Trois-Fontaines-l'Abbaye, Chancenay, Bettancourt-la-Ferrée, Ancerville (Meuse department), Chamouilley, Eurville-Bienville, Troisfontaines-la-Ville, Humbécourt, Laneuville-au-Pont, Moëslains, Valcourt, Hallignicourt and Villiers-en-Lieu.