The municipalities in Flanders are in dutch (some can be in english). The municipalities of Wallonia are in French and the ones in Brussels are in both.
Since there can only be 500 answers, i had to cut some municipalities from Wallonia: (Ouffet, Oupeye, Paliseul, Pecq, Pepinster, Péruwelz, Perwez, Philippeville, Plombières, Pont-à-Celles, Profondeville, Quaregnon, Quévy, Quiévrain, Raeren, Ramillies, Rebecq, Remicourt, Rendeux, Rixensart, Rochefort, Rouvroy, Rumes, Sainte-Ode, Saint-Georges-sur-Meuse, Saint-Ghislain, Saint-Hubert, Saint-Léger-en-Gaume, Saint-Nicolas, Saint-Vith, Samberville, Seneffe, Seraing, Silly, Sivry-Rance, Soignies, Sombreffe, Somme-Leuze, Soumagne, Spa, Spirmont, Stavelot, Stoumont, Tellin, Tenneville, Theux, Thimister-Clermont, Thuin, Tinlot, Tintigny, Tournai, Trois-Ponts, Trooz, Tubize, Vaux-sur-Sûre, Verlaine, Verviers, Vielsalm, Villers-la-Ville, Villers-le-Bouillet, Viroinval, Virton, Visé, Vresse-sur-Semois, Waimes, Walcourt, Walhain, Wanze, Waremme, Wasseiges, Waterloo, Wavre, Welkenraedt, Wellin, Yvoir.)