Mackay is a city located in Custer County, in the state of Idaho (ID), United States. Nestled in the Mountain division of the West region, it covers an area of 0.9 square miles (2.0 km²) and sits at an elevation of 5900 ft. With a population of approximately 566 residents, Mackay offers a peaceful, rural atmosphere.
The town's population is composed of about 48.94% males and 51.06% females, and it has a population density of 650.57 people per square mile (251.19/km²). Mackay lies at a latitude of 43.91 and a longitude of -113.61, operating in the UTC-7.
Locals reflect a blend of American ancestry, with roots primarily in United States (9.2%), followed by English (19.1%), German (16.1%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 83251.