What does a TW13 postcode tell you?

That the address lies in the TW13 district of the TW (Twickenham) postcode area, which the directory places around Greater London. The inward half of the full postcode narrows it to a street or a building; the district alone does not, and an address written with a district and no inward half cannot be checked against the register.

Does a street listed here mean an address on it exists?

It means OS Open Names lists a road of that name under the district, which is what the address lookup answers as a street-level match. It says nothing about any building on it: Great Britain publishes no open register of buildings, so the lookup answers exists: null there and confirms the street alone.

Who lives at these postcodes?

Nobody on this page. A postcode directory says whether a code is in use, never who is there, and a streets register lists roads, not occupants. The address lookup carries no field about a person and never will.

TW13 postcode district

What the public directories installed here say about the TW13 postcode district: how many of its postcodes are in use, the places OS Open Names lists for them, the streets it files under the district and the district's centroid. Counted from the national postcode directory and OS Open Names on 2026-09-18, and never about who is at an address.

postcode area	TW (Twickenham)
live postcodes	692
terminated postcodes	524
streets listed	258
centroid	51.43905, -0.40190
counted on	2026-09-18

Places the directory lists for TW13

OS Open Names places the district's postcodes in these settlements, boroughs, counties and regions, most often first. A town written as any of them matches the directory in an address lookup, and one written as another place in the TW area is reported but not scored.

Greater London
London
Hounslow
Feltham
Richmond upon Thames
Ashford
Hampton

Postcodes in use

692 postcodes in TW13 were in use on the day of the count. A postcode directory says whether a code is in use, never who is there. 524 of its 1,216 postcodes have been terminated: a real address written with one has moved on, which is not the same thing as a typo, and the address lookup scores it rather than refusing it.

Centroid: 51.43905, -0.40190 — the mean of the live postcodes' centroids, which locates the district, not any building in it.

Streets filed under TW13

OS Open Names files 258 roads under TW13. 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.

A244
Air Park Way
Alfred Road
Almond Close
Amesbury Road
April Close
Archer Court
Armstrong Road
Ashfield Avenue
Ashford Road
Aspen Way
Avenue Road
B377
B391
Badger Close
Barnlea Close
Basden Grove
Beach Grove
Beagle Close
Bear Road

the first 20 of 258, alphabetically

Check an address in TW13

The address checker opens on Great Britain with the district in the field: add the street, the number and the full postcode, and it answers the postcode's status, whether the street is filed under the district, and what kind of delivery point the address names.

Check an address in TW13

curl https://spaw.co/api/v1/address \
  -H "Authorization: Bearer sk_live_…" \
  -H "Content-Type: application/json" \
  -d '{"address": "10 Downing Street, London TW13 …", "country": "GB"}'

Common questions about TW13

What does a TW13 postcode tell you?: That the address lies in the TW13 district of the TW (Twickenham) postcode area, which the directory places around Greater London. The inward half of the full postcode narrows it to a street or a building; the district alone does not, and an address written with a district and no inward half cannot be checked against the register.
Does a street listed here mean an address on it exists?: It means OS Open Names lists a road of that name under the district, which is what the address lookup answers as a street-level match. It says nothing about any building on it: Great Britain publishes no open register of buildings, so the lookup answers exists: null there and confirms the street alone.
Who lives at these postcodes?: Nobody on this page. A postcode directory says whether a code is in use, never who is there, and a streets register lists roads, not occupants. The address lookup carries no field about a person and never will.

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.

Data synced on 2026-09-18: the newest register or postcode directory copy installed here.

Other districts in TW

Wrong result, or is it about you? If this tool said something you think is wrong, tell us and a person reads it. If Spaw is holding data about you and you never signed up here — a customer may have had your address verified, or reported that a message to it bounced — erase it yourself, confirmed by mail to that address and with no account needed.

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