CF40 postcode district

Postcodes and sectors

479 of the district's 646 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 51.62035, -3.45167, which locates the district, not a building.

Companies registered in CF40

Companies House lists 520 companies with a registered office in CF40; 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 CF40

• Rhondda Cynon Taf
• Wales
• Tonypandy
• Rhondda
• Porth

Roads filed under CF40

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.

• Adams Street
• Alaw Road
• Alfred Street
• Amos Hill
• Appletree Avenue
• Appletree Road
• Ardmore Avenue
• Ardwyn Terrace
• Arthur Street
• Ashdale Road
• Aubrey Road
• Balaclava Court
• Bank Street
• Belle View
• Berw Road
• Bishop Street
• Blaenlau Street
• Blanche Street
• Bransby Road
• Bridge Street
• Brithweunydd Road
• Broadfield Close
• Brook Street
• Brynderwen Road
• Bryn Eglwys
• Brynheulog Terrace
• Brynhyfryd
• Brynhyfryd Avenue
• Brynhyfryd Street
• Bryn Ivor Street
• Brynteg Terrace
• Bryn Terrace
• Buckley Close
• Buckley Road
• Caeau De-Winton
• Cae Glas
• Cairo Street
• Carn y Celyn Close
• Caroline Street
• Chapel Street
• Charles Street
• Church Road
• Church Street
• Clos Gellifaelog
• Clos Graigwen
• Clos y Briallu
• Clos Ynysygrug
• Clos Yr Ysgol
• Clydach Road
• Colliers Way
• Compton Road
• Constantine Street
• Cornwall Road
• Coronation Street
• Court Street
• Crabtree Road
• Crawshay Road
• Cross Row
• Cross Street
• Cwrt Gelli

Check an address in CF40

Check an address in CF40

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CF40" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CF40

What does a CF40 postcode tell you?

That the address lies in the CF40 district of the CF (Cardiff) postcode area, and the place OS Open Names most often lists first for its postcodes is Tonypandy. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 479 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 CF40

• CF392.9 km
• CF413.7 km
• CF434.1 km
• CF427.2 km
• CF458.3 km
• CF378.3 km
• CF3810.6 km
• CF7210.6 km
• CF4410.9 km
• CF3211.4 km
• CF4611.5 km
• CF3512.0 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids