Post Offices List in Catonsville City, Maryland:
| Catonsville Carrier Annex Post Office | 700 Geipe Rd Rear, Catonsville, MD 21228 |
| Catonsville Post Office | 1001 Frederick Rd, Catonsville, MD 21228 |
| Catonsville Carrier Annex Post Office | 700 Geipe Rd Rear, Catonsville, MD 21228 |
| Catonsville Post Office | 1001 Frederick Rd, Catonsville, MD 21228 |