Post Offices List in Frederick City, Maryland:
| College Estates Post Office | 1301 W 7th St, Frederick, MD 21702 |
| Frederick Post Office | 201 E Patrick St, Frederick, MD 21701 |
| College Estates Post Office | 1301 W 7th St, Frederick, MD 21702 |
| Frederick Post Office | 201 E Patrick St, Frederick, MD 21701 |