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 Range View", is located 75 miles southeast of Tucson and serves as the main commercial, cultural, and recreational hub of Cochise County.