| Postal Service | Bel Air |
| Division | Harford |
| Post code | 21014 |
| Postal Service | Abingdon |
| Division | Harford |
| Post code | 21009 |
| Postal Service | Bel Air |
| Division | Harford |
| Post code | 21015 |
| Postal Service | Aberdeen |
| Division | Harford |
| Post code | 21001 |
| Postal Service | Edgewood |
| Division | Harford |
| Post code | 21040 |
| Postal Service | Havre De Grace |
| Division | Harford |
| Post code | 21078 |
| Postal Service | Forest Hill |
| Division | Harford |
| Post code | 21050 |
| Postal Service | Joppa |
| Division | Harford |
| Post code | 21085 |
| Postal Service | Fallston |
| Division | Harford |
| Post code | 21047 |
| Postal Service | Jarrettsville |
| Division | Harford |
| Post code | 21084 |
19 City in Harford | List of Zip Codes Location In Maryland and Your selected County Harford