| Business | Phone |
| Post Office Newark 308 Thomas St, Newark 7114 | (973) 465-9065 |
| Us Post Office 1 Riverfront Plz, Newark 7102 | (973) 000-1111 |
| Us Post Office 11 Commerce St, Newark 7102 | (973) 000-1111 |
| Us Post Office 2 Federal Sq, Newark 7102 | (973) 693-5200 |
| Us Post Office 210 Stuyvesant Ave, Newark 7106 | (973) 000-1111 |
| Us Post Office 243 Broadway, Newark 7104 | (973) 000-1111 |
| Us Post Office 259 Ferry St, Newark 7105 | (973) 000-1111 |
| Us Post Office 345 Newark Airport, Newark 7114 | (973) 000-1111 |
| Us Post Office 374 7th Ave, Newark 7107 | (973) 000-1111 |
| Us Post Office 40 Clinton St, Newark 7102 | (973) 000-1111 |
| Us Post Office 43 Merchant St, Newark 7105 | (973) 690-5006 |
| Us Post Office 494 Broad St, Newark 7102 | (973) 468-7000 |
| Us Post Office 514 Frelinghuysen Ave, Newark 7114 | (973) 000-1111 |
| Us Post Office 6 Atlantic St, Newark 7102 | (973) 000-1111 |