Nicolet-Yamaska is a regional county municipality in the Centre-du-Québec region of Quebec, Canada.The county seat is Nicolet.SubdivisionsThere are 16 subdivisions within the RCM:Cities & Towns Nicolet Municipalities Aston-Jonction Baie-du-Febvre Grand-Saint-Esprit La Visitation-de-Yamaska Pierreville Saint-Célestin| valign="top" | Saint-François-du-Lac Saint-Léonard-d'Aston Saint-Wenceslas Sainte-Eulalie Sainte-Monique Parishes Saint-Elphège Sainte-Perpétue Saint-Zéphirin-de-Courval Villages Saint-Célestin