Sierra Vista, a beautiful mountain community located in Cochise County, Arizona, is an excellent place to call home. Here's a quick look at Sierra Vista, AZ demographics. Sierra Vista, AZ Demographics Sierra Vista has a population just over 44,000, making it one of the most populated cities in Cochise County. It covers an area of 143 square miles, while the entire county spans 6,219 square miles. The median household income in Sierra Vista is approximately $59,000, and the average housing price is around $160,000. There are six public elementary schools, one public middle school … Continue reading...