| Business | Phone |
| Us Post Office 5530 S Sohl Ave, Hammond 46320 | (219) 932-0345 |
| Us Post Office 6530 Kennedy Ave, Hammond 46323 | (219) 844-2416 |
| Us Post Office 7142 Calumet Ave, Hammond 46324 | (219) 931-7707 |
| Us Post Office 7856 Interstate Plaza Dr, Hammond 46324 | (219) 844-6700 |