New Mexico (Spanish: Nuevo México [ˈnweβo ˈmexiko]; Navajo: Yootó Hahoodzo [jò:txó hàhò:tsò]) is a state located in the southwestern region of the United States of America. It was admitted to the union as the 47th state on January 6, 1912. It is usually considered one of the Mountain States. New Mexico is fifth by area, the 36th-most populous, and the sixth-least densely populated of the 50 United States.