Post Offices List in Calumet City, Michigan:
| Calumet Post Office | 201 6th St, Calumet, MI 49913 |
| Laurium Post Office | 75 3rd St, Calumet, MI 49913 |
| Calumet Post Office | 201 6th St, Calumet, MI 49913 |
| Laurium Post Office | 75 3rd St, Calumet, MI 49913 |