| Business | Phone |
| Us Post Office 1309 Cambridge St, Cambridge 2139 | (617) 000-1111 |
| Us Post Office 25 East St, Cambridge 2141 | (617) 000-1111 |
| Us Post Office 125 Mount Auburn St, Cambridge 2138 | (617) 000-1111 |
| Us Post Office 1311 Cambridge St, Cambridge 2139 | (617) 864-4344 |
| Us Post Office 1953 Massachusetts Ave, Cambridge 2140 | (617) 000-1111 |
| Us Post Office 250 Main St, Cambridge 2142 | (617) 000-1111 |
| Us Post Office 303 Cambridge St, Cambridge 2141 | (617) 000-1111 |
| Us Post Office 770 Massachusetts Ave, Cambridge 2139 | (617) 000-1111 |