Post office locations in 21742
| Post Office | Address | Phone | Hours |
| NORTHERN | 12912 CONAMAR DR HAGERSTOWN, MD 21742 - 9998 | 301-733-9195 | Mon-Fri 8:30am - 5:00pm Sat 10:00am - 1:00pm Sun Closed |
| Post Office | Address | Phone | Hours |
| NORTHERN | 12912 CONAMAR DR HAGERSTOWN, MD 21742 - 9998 | 301-733-9195 | Mon-Fri 8:30am - 5:00pm Sat 10:00am - 1:00pm Sun Closed |