CF3 postcode district

Postcodes and sectors

922 of the district's 1,973 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 51.52062, -3.11130, which locates the district, not a building.

Companies registered in CF3

Companies House lists 2,810 companies with a registered office in CF3; 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 CF3

• Wales
• Cardiff
• Caerdydd
• Casnewydd
• Newport
• Marshfield
• Castleton
• Caerffili
• Caerphilly
• Llanbedr Gwynllwg
• Peterstone Wentlooge
• Began
• Michaelstone Bridge
• Newton
• Michaelston-y-Fedw

Roads filed under CF3

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.

• Aberdaron Road
• Abergele Close
• Abergele Road
• Abernethy Close
• Acorn Place
• Afon Close
• Alderwood Close
• Allen Close
• Arlington Crescent
• Arnold Avenue
• Ashburton Avenue
• Ashdown Close
• Ashfield Court
• Aspen Close
• Aster Close
• Aston Place
• Austen Close
• Axbridge Crescent
• Bakery Lane
• Ball Close
• Ball Lane
• Ball Road
• Bampton Road
• Banwell Place
• Barmouth Road
• Barnstaple Road
• Bassaleg Close
• Beaumaris Road
• Bedwas Close
• Began Road
• Bethania Row
• Bideford Road
• Birkdale Close
• Blackbirds Way
• Blackmoor Place
• Blacktown Gardens
• Blaenavon Close
• Blagdon Close
• Blaina Close
• Bluebell Drive
• Bodnant Close
• Borth Road
• Boswell Close
• Boyce Way
• Brachdy Close
• Brachdy Lane
• Brachdy Road
• Braunton Avenue
• Braunton Crescent
• Brayford Place
• Brendon Close
• Bridge Road
• Bridge Terrace
• Bridgwater Road
• British Legion Drive
• Broadlands Court
• Broadwell Close
• Bro Athro
• Brockhampton Road
• Bronte Close

Check an address in CF3

Check an address in CF3

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CF3" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CF3

What does a CF3 postcode tell you?

That the address lies in the CF3 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 922 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 CF3

• CF233.1 km
• CF245.0 km
• CF146.4 km
• CF106.7 km
• CF117.7 km
• NP107.7 km
• CF510.2 km
• CF8310.5 km
• NP2010.6 km
• CF1511.2 km
• CF6411.3 km
• NP1912.7 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids