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.
Phone Area Codes in Sierra Vista, AZ: 520

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