Post office locations in 21791
| Post Office | Address | Phone | Hours |
| UNION BRIDGE | 111 PENROSE ST UNION BRIDGE, MD 21791 - 9998 | 410-775-2510 | Mon-Fri 08:30 AM - 01:00 PM 02:00 PM - 04:30 PM Sat 08:30 AM - 12:00 PM Sun Closed |
| Post Office | Address | Phone | Hours |
| UNION BRIDGE | 111 PENROSE ST UNION BRIDGE, MD 21791 - 9998 | 410-775-2510 | Mon-Fri 08:30 AM - 01:00 PM 02:00 PM - 04:30 PM Sat 08:30 AM - 12:00 PM Sun Closed |