HA - Harrow
The postal area HA (Harrow) comprises of the following post towns; these towns should be written in capital letters when used in addresses.
Postal Districts within HA - Harrow
| Country | Post Town | Postal District |
| England | Harrow | HA1 HA2 HA3 |
| Ruislip | HA4 | |
| Pinner | HA5 | |
| Northwood | HA6 | |
| Stanmore | HA7 | |
| Edgware | HA8 | |
| Wembley | HA9 HA0 |
