Ario is a municipality located in the Mexican state of Michoacán. The municipality has an area of 694.60 square kilometres (1.18% of the surface of the state) and is bordered to the north by Salvador Escalante, to the east by Tacámbaro and Turicato, to the south by La Huacana, to the west by Nuevo Urecho, and to the northwest by Taretán. The municipality had a population of 31, 647 inhabitants according to the 2005 census.