TN21 postcode district

Postcodes and sectors

713 of the district's 992 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 50.95807, 0.26306, which locates the district, not a building.

Companies registered in TN21

Companies House lists 1,252 companies with a registered office in TN21; 282 of them at addresses 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 TN21

• East Sussex
• South East
• Wealden
• Heathfield
• Horam
• Rother
• Broad Oak
• Cross in Hand
• Punnett's Town
• Cade Street
• Rushlake Green
• Vines Cross
• Maynard's Green
• Roser's Cross
• Waldron
• Burlow
• Old Heathfield
• Wood's Corner
• Little London
• Gun Hill
• Three Cups Corner
• Marle Green
• Dallington
• Cogger's Cross

Roads filed under TN21

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.

• Alder Close
• Alexandra Road
• All Saints Gardens
• Ashdown Place
• Ash Tree Close
• Aspen Walk
• Autumn Drive
• Back Lane
• Ballsocks Lane
• Barley Mow Lane
• Battle Road
• Bay Tree Close
• Beauford Road
• Beeches Close
• Beechwood Lane
• Birch Way
• Blackberry Mews
• Blackdown Road
• Brackenside
• Bracken Way
• Bramley Avenue
• Bridge Close
• Brittenden Lane
• Broadhill Close
• Broad View
• Browning Road
• Browns Lane
• Burwash Road
• Cade Street
• Cambridge Lane
• Cart Barn Place
• Centenary Drive
• Chalky Place
• Chamomile Close
• Chapmans Town Road
• Cherry Gardens
• Cherwell Road
• Chiddingly Road
• Churchill Road
• Church Street
• Cogger's Lane
• Colliers Green
• Collingwood Avenue
• Collingwood Rise
• Coppice View
• Cornflower Avenue
• Cowden Hall Lane
• Crown Drive
• Cuckmere Rise
• Cuckoo Drive
• Dads Hill
• Dern Lane
• Discovery Way
• Downline Close
• Downsview
• Edgehill Close
• Elliots Way
• Elm Way
• Fair Oak Close
• Fallow Drive

Check an address in TN21

Check an address in TN21

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=TN21" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about TN21

What does a TN21 postcode tell you?

That the address lies in the TN21 district of the TN (Tonbridge) postcode area, and the place OS Open Names most often lists first for its postcodes is Heathfield. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 713 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 TN21

• TN206.6 km
• BN279.6 km
• TN1911.2 km
• TN2211.7 km
• TN612.1 km
• TN513.3 km
• BN815.4 km
• BN2615.5 km
• TN3315.7 km
• TN3216.1 km
• BN2416.3 km
• TN3918.1 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids