Kathy L Melvin (Postmaster)
kathy.l.melvin@usps.gov
129 S Rowland St
Cassopolis, MI 49031
Cassopolis, MI 49031
The Cassopolis Post Office is located in the state of Michigan within Cass County. This location serves 7,884 Cassopolis residents with a median income of $44,649. It's estimated that approximately 12,584 packages pass through this post office each year.