Sierra Vista is a city in Cochise County, Arizona, United States. As of the 2010 census the population of the city was 43,888. The city is part of the Sierra Vista-Douglas Metropolitan Area, with a 2010 population of 131,346. Fort Huachuca, a U.S. Army post, is located in the northwest part of the city.
Sierra Vista, which is Spanish for "Mountain View", is located 75 miles (121 km) southeast of Tucson and serves as the main commercial, cultural, and recreational hub of Cochise County.
As evidenced by several neolithic sites and known archeological sites, Paleo-Indians have been in southern Arizona from a long time ago. It was the home to a large Sobaipuri, Pueblo near Fairbank which had several smaller pueblos and settlements throughout the valley, a Spanish Fort, Presidio Santa Cruz de Terrenate between modern Huachuca City, Whetstone and Tombstone, on the Western bank of the San Pedro River. along with sparse Spanish settlers supporting the route to Tucson's Mission San Xavier del Bac and Presidio San Agustín del Tucsón.
Like most of Cochise County it was part of the Gadsden Purchase. At the end of the Apache Wars, with the protection of Fort Huachuca and the completion of the Southern Pacific and El Paso & Southwestern railroads, the San Pedro Valley began to be populated by American Settlers.
The first business that opened just outside the east gate of Fort Huachuca was a saloon and house of ill repute owned by John and Ellen Reilly opened in 1892. In 1911, Margaret Carmichael bought the Reilly homestead and business.