| District | Post Town | Coverage | Postcodes |
|---|---|---|---|
| HA0 | Wembley | Alperton, Sudbury, Sudbury Hill, Wembley Central, North Wembley | 855 |
| HA1 | Harrow | Harrow, North Harrow, Northwick Park | 945 |
| HA2 | Harrow | North Harrow, South Harrow | 964 |
| HA3 | Harrow | Harrow Weald, Kenton, Wealdstone | 1,269 |
| HA4 | Ruislip | Ruislip | 1,140 |
| HA5 | Pinner | Pinner, Eastcote, Hatch End, Carpenders Park | 1,100 |
| HA6 | Northwood | Northwood, Moor Park, Sandy Lodge | 724 |
| HA7 | Stanmore | Stanmore | 856 |
| HA8 | Edgware | Edgware | 1,404 |
| HA9 | Wembley | Wembley, Wembley Park, Wembley Central, Preston, Tokyngton | 989 |