Post office locations in 21742
| Post Office | Address | Phone | Hours |
| NORTHERN | 12912 CONAMAR DR HAGERSTOWN, MD 21742 - 9998 | 301-733-9195 | Mon-Fri 08:30 AM - 05:00 PM Sat 10:00 AM - 01:00 PM Sun Closed |
| Post Office | Address | Phone | Hours |
| NORTHERN | 12912 CONAMAR DR HAGERSTOWN, MD 21742 - 9998 | 301-733-9195 | Mon-Fri 08:30 AM - 05:00 PM Sat 10:00 AM - 01:00 PM Sun Closed |