Schools in Mackay, Idaho, the US. Schools locations in Mackay, Idaho. Find the nearest schools locations, near you. All types of business services ATM Finance Insurance Real estate School Travel All schools in Mackay Mackay Junior-Senior High School School +1 208-588-2262 Mackay, Mackay, Idaho 83251 Write a review Phone Website Directions Three Sisters Ranch School +1 208-726-5191 4876, 5600 West, Mackay, Idaho 83251 Write a review Phone Website Directions