Zamora de Hidalgo, is a city in the Mexican state of Michoacán. The 2010 census population was 141,627. making it the third largest city in the state. The city is the municipal seat of Zamora Municipality, which has an area of 330.97 km² (127.79 sq mi) and includes many other smaller communities, the largest of which is Ario de Rayón (Ario Santa Mónica).