SY18 postcode district

Postcodes and sectors

226 of the district's 247 postcodes are live in the ONS Postcode Directory of August 2026. A postcode directory says whether a code is in use, never who is there. The live postcodes centre on 52.44176, -3.54930, which locates the district, not a building.

Companies registered in SY18

Companies House lists 150 companies with a registered office in SY18; none of them at an address shared by 25 or more companies (1 October 2026 snapshot). 25 is the count at which the address lookup reports a company cluster.

Places OS Open Names lists for SY18

• Powys
• Wales
• Llanidloes
• Llangurig
• Y Fan
• Cwmbelan
• Tylwch
• Glan-y-nant
• Tan Hinon
• Llanifyny
• Pant Mawr

Roads filed under SY18

Named roads first, then numbered ones. A road is filed under one district even where it runs through several, so a street missing here may be listed under a neighbouring district — which is why the address lookup never calls a British street absent. Great Britain has no open register of buildings, so a listed road never means a building on it exists.

• Bethel Street
• Bro Dulas
• Brook Street
• Bryn-Du Road
• Cae'r Hen Ysgol
• Cae Capel
• Caegwyn
• Caegwyn Isaf
• Cambrian Place
• Castle Street
• Cefn Road
• Cemetery Square
• Chapel Street
• China Street
• Church Lane
• Church Place
• Church Street
• Clos yr Hen Ysgol
• Coed-y-Llan
• Dolgwenith
• Eastgate Street
• Foundry Lane
• Foundry Terrace
• Garden Suburb
• Gerddi Glandwr
• Gorn Road
• Great Oak Street
• Gwaelod-y-Bryn
• Hafren Close
• High Street
• Hillfield
• Llangurig Road
• Llys Clywedog
• Long Bridge Street
• Lon Glandwr
• Maes Capel
• Maescurig
• Maesydre
• Maes y Gwy
• Maesyllan
• Mount Lane
• Nant Ceiriog
• New Street
• Newtown Road
• Parc Curig
• Parc Derw
• Parc Llwyn
• Pen-y-Borfa
• Pengeulan
• Pen Rhos-y-Maen
• Penygraig Street
• Penygreen Road
• Picton Street
• Rhos-y-Maen Isaf
• Rhos-y-Maen Uchaf
• Short Bridge Street
• Smithfield Street
• Smithfield Terrace
• Tan-y-Bryn
• Tan-y-Groes

Check an address in SY18

Check an address in SY18

The same road list through the API, from the outward code alone:

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SY18" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SY18

What does an SY18 postcode tell you?

That the address lies in the SY18 district of the SY (Shrewsbury) postcode area, and the place OS Open Names most often lists first for its postcodes is Llanidloes. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 226 live postcodes.

Where the counts come from

• ons-postcode-directory · version 2026-08 · Contains ONS, OS and Royal Mail data © Crown copyright and database right 2026, Open Government Licence v3.0. Northern Ireland postcodes are excluded: their reuse needs a Land & Property Services licence.
• os-open-names · version 2026-11-01 · Contains OS data © Crown copyright and database right 2026, Open Government Licence v3.0.
• uk-companies-house · version 2026-10-01 · Companies House free company data product, Open Government Licence v3.0

What each figure means, and what a district page never says, is set out in Reading a British postcode district page; the glossary defines a postcode district, a postcode area, a postcode directory and a street register.

Data synced on 2026-11-01: the newest version among the datasets listed above.

Districts nearest SY18

• SY1710.0 km
• LD614.9 km
• SY1916.3 km
• SY1618.3 km
• LD123.6 km
• SY2026.5 km
• SY1530.8 km
• SY2432.1 km
• LD732.7 km
• SY2133.4 km
• SY2534.7 km
• SY2334.8 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids