CB21 postcode district

Postcodes and sectors

446 of the district's 534 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 52.12804, 0.28118, which locates the district, not a building.

Companies registered in CB21

Companies House lists 836 companies with a registered office in CB21; 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 CB21

• Eastern
• Cambridgeshire
• South Cambridgeshire
• Linton
• Fulbourn
• Balsham
• Great Abington
• Castle Camps
• Horseheath
• Great Wilbraham
• Uttlesford
• Essex
• Hadstock
• West Wratting
• Little Abington
• Hildersham
• Shudy Camps
• Little Wilbraham
• West Wickham
• Bartlow
• Weston Green
• Weston Colville
• Nosterfield End
• Cardinal's Green

Roads filed under CB21

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.

• Alec Rolph Close
• All Saints Road
• Angle End
• Anvil Close
• Apthorpe Street
• Armistice Close
• Audley Way
• Babraham Road
• Back Hill
• Back Road
• Bakers Lane
• Balingdon Lane
• Balsham Road
• Bangs Close
• Barleyfields
• Barley Way
• Barrows Way
• Bartlow Broad Balk
• Bartlow Road
• Bartons Close
• Bawtree Crescent
• Beech Way
• Bensteads End
• Bilberry End
• Bird Farm Road
• Blacksmiths Lane
• Blench Lane
• Blenheim Rise
• Bolts Hill
• Bourn Bridge Road
• Breckenwood Road
• Brinkley Road
• Brinkman Road
• Brunswick Court
• Bullen Way
• Bull Lane
• Burrell Way
• Burton End
• Butt Lane
• Cambridge Road
• Camps Road
• Caraway Road
• Carsey Hill
• Castle Meadow
• Cedar Close
• Chaffinch Road
• Chalklands
• Chalky Road
• Chapel Meadows
• Chapel Road
• Chaplin's Close
• Cherry Close
• Cherry Orchard
• Church Close
• Church End
• Church Lane
• Church Path
• Church Road
• Church Street
• Clamp's Lane

Check an address in CB21

Check an address in CB21

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CB21" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CB21

What does a CB21 postcode tell you?

That the address lies in the CB21 district of the CB (Cambridge) postcode area, and the place OS Open Names most often lists first for its postcodes is Linton. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 446 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 CB21

• CB229.9 km
• CB1011.1 km
• CB911.9 km
• CB112.1 km
• CB212.5 km
• CB512.7 km
• CB414.8 km
• CB2515.0 km
• CB1115.1 km
• CB815.3 km
• CB315.7 km
• SG821.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids