Mackay is located in Custer County. About 439 people live here (as of 2020). Between 2010 and 2020, the population declined from 517 to 439. The region is at 1800 meters above sea level. The area covers about 2.2 square kilometers. There are about 48 streets in Mackay. The postal codes are 83251. The dialing code is 208. Mackay is city in Custer County, Idaho, United States. Among other things, Mackay has hotels, restaurants, supermarkets, schools and banks. More information at
mackayidaho-city.com.