SY - Shrewsbury
The postal area SY (Shrewsbury) comprises of the following post towns; these towns should be written in capital letters when used in addresses.
Postal Districts within SY - Shrewsbury
| Country | Post Town | Postal District |
| England | Shrewsbury | SY1 SY2 SY3 SY4 SY5 |
| Church Stretton | SY6 | |
| Bucknall Craven Arms Lydbury North |
SY7 | |
| Ludlow | SY8 | |
| Bishops Castle | SY9 | |
| Oswestry | SY10 SY11 |
|
| Ellesmere | SY12 | |
| Whitchurch | SY13 | |
| Malpas | SY14 | |
| Wales | Montgomery | SY15 |
| Newtown | SY16 | |
| Caersws Llandinam |
SY17 | |
| Llanidloes | SY18 | |
| Llanbrynmair | SY19 | |
| Machynlleth | SY20 | |
| Welshpool | SY21 | |
| Llanfechain Llanfyllin Llansantffraid Llanymynech Meifod |
SY22 | |
| Aberystwyth Llanon Llanhystyd |
SY23 | |
| Borth Bow Street Talybont |
SY24 | |
| Tregaron Ystrad Meurig |
SY25 |
