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 8:30am - 1:00pm 2:00pm - 4:30pm Sat 8:30am - 12:00pm Sun Closed |
| Post Office | Address | Phone | Hours |
| UNION BRIDGE | 111 PENROSE ST UNION BRIDGE, MD 21791 - 9998 | 410-775-2510 | Mon-Fri 8:30am - 1:00pm 2:00pm - 4:30pm Sat 8:30am - 12:00pm Sun Closed |