| Business | Phone |
| Us Post Office 125 Glenridge Ave, Montclair 7042 | (973) 744-9187 |
| Us Post Office 128 Watchung Ave, Montclair 7043 | (973) 655-1431 |
| Us Post Office 242 Bellevue Ave, Montclair 7043 | (973) 744-0478 |
| Us Post Office 50 Fairfield St, Montclair 7042 | (973) 746-3468 |
| Us Post Office 572 Valley Rd # U, Montclair 7043 | (973) 000-1111 |