CF23 postcode district

Postcodes and sectors

908 of the district's 1,270 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 51.51451, -3.15557, which locates the district, not a building.

Companies registered in CF23

Companies House lists 2,947 companies with a registered office in CF23; 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 CF23

• Cardiff
• Caerdydd
• Wales

Roads filed under CF23

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.

• Acorn Grove
• Ael-y-Bryn
• Agincourt Road
• Alderbrook
• Alder Road
• Alltmawr Road
• Allt y Wennol
• Alma Road
• Almond Drive
• Amber Close
• Ambergate Drive
• Amberley Close
• Amberwood Close
• Amblecote Close
• Ambleside Avenue
• Ambrooke Close
• Amesbury Road
• Arnside Road
• Attfield Close
• Axminster Road
• Azalea Close
• Baber Close
• Baltimore Close
• Barnfield Close
• Baron's Court Road
• Beatty Avenue
• Beck Court
• Berrymead Road
• Bettws-y-Coed Road
• Birchwood Lane
• Birchwood Road
• Blackberry Way
• Black Oak Road
• Blenheim Road
• Boleyn Walk
• Borage Close
• Borrowdale Close
• Boverton Street
• Bramshill Drive
• Brandreth Gardens
• Brandreth Road
• Briarwood Drive
• Bronwydd Avenue
• Bronwydd Close
• Bryn-Awelon Road
• Bryn-Gwyn Road
• Bryn-y-Nant
• Bryn Celyn
• Bryn Celyn Road
• Bryncyn
• Brynderwen Close
• Brynfedw
• Bryn Haidd
• Brynheulog
• Brynheulog Court
• Bryn Pinwydden
• Brynteg Close
• Burwell Close
• Butterfield Drive
• Caer Cady Close

Check an address in CF23

Check an address in CF23

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CF23" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CF23

What does a CF23 postcode tell you?

That the address lies in the CF23 district of the CF (Cardiff) postcode area, and the place OS Open Names most often lists first for its postcodes is Cardiff. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 908 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 CF23

• CF243.0 km
• CF33.1 km
• CF143.4 km
• CF104.6 km
• CF115.3 km
• CF57.1 km
• CF158.3 km
• CF839.2 km
• CF649.4 km
• NP1010.3 km
• CF3813.3 km
• NP2013.3 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids