The coat of arms of Zaanstad has been formally acknowledged since 27 February 1974. The coat of arms was previously that of the jurisdictional area of Westsane en Crommenie, which now form the municipality of Zaanstad. These two areas were on the same areas as the municipalities who fused in 1974 to become the municipality of Zaanstad. The municipality of Assendelft alone used a coat of arms who didn't look like those of the other municipalities. The other municipalities and places (Koog aan de Zaan, Krommenie, Westzaan, Wormerveer, Zaandam en Zaandijk) used a coat of arms with four lions in it.