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. Its municipal seat is the city of
Ario de Rosales.