Sierra Vista is a city located in Cochise County, Arizona, United States. It is located about 75 miles southeast of Tucson and is known for its proximity to Fort Huachuca, a major U.S. Army installation. Sierra Vista has a population of approximately 45,000 people and is the largest city in Cochise County. The city is surrounded by beautiful desert landscapes and is a popular destination for outdoor activities such as hiking, birdwatching, and wildlife viewing. It also offers a variety of amenities including shopping centers, restaurants, and cultural attractions.