Post office locations in 21837
| Post Office | Address | Phone | Hours |
| MARDELA SPRINGS | 301 RAILROAD AVE MARDELA SPRINGS, MD 21837 - 9998 | 410-546-9050 | Mon-Fri 08:30 AM - 12:30 PM 02:30 PM - 04:30 PM Sat 08:30 AM - 11:15 AM Sun Closed |
| Post Office | Address | Phone | Hours |
| MARDELA SPRINGS | 301 RAILROAD AVE MARDELA SPRINGS, MD 21837 - 9998 | 410-546-9050 | Mon-Fri 08:30 AM - 12:30 PM 02:30 PM - 04:30 PM Sat 08:30 AM - 11:15 AM Sun Closed |