Battle Creek

Central Michigan

Cheboygan

Detroit District

Farmington

Flint Area

480-481 Area

486-487 Area

498-499 (U.P. Area)

Gaylord

Great Lakes Area Mail Haulers

Jackson

Ludington

Muskegon

Roger City

Sault Ste Marie

Southwest Michigan

Stevensville

Traverse City

Troy

Western Michigan