Post office locations in 02138
| Post Office | Address | Phone | Hours |
| HARVARD SQUARE | 125 MOUNT AUBURN ST STE 1 CAMBRIDGE, MA 02138 - 9998 | 617-876-3883 | Mon-Fri 07:30 AM - 06:00 PM Sat 07:30 AM - 03:00 PM Sun Closed |
| PORTER SQUARE CARRIER ANNEX | 15 MOONEY ST CAMBRIDGE, MA 02138 - 9991 | 617-492-8778 |