Post office locations in 21664
| Post Office | Address | Phone | Hours |
| SECRETARY | 145 MAIN ST SECRETARY, MD 21664 - 9998 | 410-943-3792 | Mon-Fri 7:30am - 12:30pm 1:30pm - 4:30pm Sat 7:30am - 10:30am Sun Closed |
| Post Office | Address | Phone | Hours |
| SECRETARY | 145 MAIN ST SECRETARY, MD 21664 - 9998 | 410-943-3792 | Mon-Fri 7:30am - 12:30pm 1:30pm - 4:30pm Sat 7:30am - 10:30am Sun Closed |