Districts in the SY area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| SY1 | Shrewsbury | Shropshire | 5 | 1,035 |
| SY2 | Shrewsbury | Shropshire | 2 | 580 |
| SY3 | Shrewsbury | Shropshire | 6 | 1,113 |
| SY4 | Wem | Shropshire | 6 | 1,083 |
| SY5 | Pontesbury | Shropshire | 5 | 1,069 |
| SY6 | Church Stretton | Shropshire | 2 | 322 |
| SY7 | Craven Arms | Shropshire | 4 | 566 |
| SY8 | Ludlow | Shropshire | 5 | 824 |
| SY9 | Bishop's Castle | Shropshire | 1 | 137 |
| SY10 | Weston Rhyn | Shropshire | 5 | 834 |
| SY11 | Oswestry | Shropshire | 4 | 994 |
| SY12 | Ellesmere | Shropshire | 2 | 381 |
| SY13 | Whitchurch | Shropshire | 5 | 882 |
| SY14 | Malpas | Cheshire West and Chester | 2 | 347 |
| SY15 | Montgomery | Powys | 1 | 255 |
| SY16 | Newtown | Powys | 5 | 691 |
| SY17 | Caersws | Powys | 1 | 178 |
| SY18 | Llanidloes | Powys | 1 | 225 |
| SY19 | Llanbrynmair | Powys | 1 | 55 |
| SY20 | Machynlleth | Powys | 3 | 421 |
| SY21 | Welshpool | Powys | 5 | 872 |
| SY22 | Llanfyllin | Powys | 2 | 420 |
| SY23 | Aberystwyth | Ceredigion | 6 | 985 |
| SY24 | Borth | Ceredigion | 1 | 145 |
| SY25 | Tregaron | Ceredigion | 1 | 218 |
| SY99 | Shrewsbury | Shropshire | 1 | 8 |
Main places in the SY area
- Shrewsbury
- Oswestry
- Aberystwyth
- Newtown
- Ludlow
- Whitchurch
- Welshpool
- Wem
- Bayston Hill
- Ellesmere
- Church Stretton
- Llanidloes
- Craven Arms
- St Martins
- Gobowen
- Machynlleth
- Pontesbury
- Malpas
- Llanbadarn Fawr
- Baschurch
- Weston Rhyn
- Whittington
- Bishop's Castle
- Llanfyllin
- Shawbury
- Bomere Heath
- Montgomery
- Llanfair Caereinion
- Minsterley
- Caersws