Post Offices List in Cass County, Michigan:
| Cassopolis Post Office | 129 S Rowland St, Cassopolis, MI 49031 |
| Dowagiac Post Office | 202 Commercial St, Dowagiac, MI 49047 |
| Edwardsburg Post Office | 68926 Cass St, Edwardsburg, MI 49112 |
| Jones Post Office | 12081 M 60, Jones, MI 49061 |
| Marcellus Post Office | 203 S Centre St, Marcellus, MI 49067 |
| Vandalia Post Office | 17899 MIll St, Vandalia, MI 49095 |
| Union Post Office | 15479 Us Highway 12 Apt A, Union, MI 49130 |