SY postcode area
The SY area holds 26 districts and 14,640 live postcodes; its largest place is Shrewsbury.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| SY1 | 1,035 | Shrewsbury |
| SY2 | 580 | — |
| SY3 | 1,113 | Bayston Hill |
| SY4 | 1,083 | Wem |
| SY5 | 1,069 | Pontesbury |
| SY6 | 322 | Church Stretton |
| SY7 | 566 | Craven Arms |
| SY8 | 824 | Ludlow |
| SY9 | 137 | Bishop's Castle |
| SY10 | 834 | Pant |
| SY11 | 994 | Oswestry |
| SY12 | 381 | Ellesmere |
| SY13 | 882 | Whitchurch |
| SY14 | 347 | Malpas |
| SY15 | 255 | Montgomery |
| SY16 | 691 | Newtown |
| SY17 | 178 | Caersws |
| SY18 | 225 | Llanidloes |
| SY19 | 55 | — |
| SY20 | 421 | Machynlleth |
| SY21 | 872 | Welshpool |
| SY22 | 420 | Four Crosses |
| SY23 | 985 | Aberystwyth |
| SY24 | 145 | Bow Street |
| SY25 | 218 | Tregaron |
| SY99 | 8 | — |
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.