Home/PostalMag/Post Office Photos/Idlewild, Michigan Post Office 49642 Post Office Photos Idlewild, Michigan Post Office 49642 PostalMag · Saturday, January 02, 2021 The Idlewild, Michigan Post Office serves ZIP Code 49642. Photo by conatz, some rights reserved. Photo shared under the Creative Commons License. Idlewild Post Office 812 Essex Dr Idlewild, MI 49642