SL3 postcode district

Postcodes and sectors

1,077 of the district's 1,709 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 51.49870, -0.55132, which locates the district, not a building.

Companies registered in SL3

Companies House lists 6,467 companies with a registered office in SL3; 747 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 SL3

• South East
• Slough
• Windsor and Maidenhead
• Datchet
• Buckinghamshire
• Poyle
• Colnbrook
• George Green
• Horton
• Wexham Street
• Fulmer
• Stoke Poges
• Myrke

Roads filed under SL3

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.

• Accommodation Lane
• Acorn Close
• Adelaide Road
• Agars Place
• Aintree Close
• Akerman Close
• Alan Way
• Albany Park
• Aldenham Close
• Alderbourne Lane
• Alderbury Road
• Alderbury Road West
• Allen Way
• Allhusen Gardens
• Alsford Place
• Amanda Court
• Appletree Lane
• Arkwright Road
• Arundel Court
• Ash Close
• August End
• Augustine Close
• Austen Way
• Avenue Drive
• Azalea Way
• Bannister Close
• Barchester Road
• Barton Road
• Bates Close
• Bath Road
• Beacon Court
• Beaulieu Close
• Beckett Chase
• Beech Road
• Bellman Close
• Bells Lane
• Benjamin Lane
• Bessemer Close
• Black Park Road
• Blacksmith Row
• Blackthorn Dell
• Blackthorne Road
• Blandford Close
• Blandford Road North
• Blandford Road South
• Blenheim Close
• Blenheim Road
• Blinco Lane
• Blunden Drive
• Bouverie Way
• Boxall Way
• Brackenforde
• Brands Road
• Bridge Street
• Bridgewater Court
• Broad Platts
• Brookside
• Buccleuch Road
• Buckland Avenue
• Buckland Gate

Check an address in SL3

Check an address in SL3

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SL3" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SL3

What does an SL3 postcode tell you?

That the address lies in the SL3 district of the SL (Slough) postcode area, and the place OS Open Names most often lists first for its postcodes is Slough. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,077 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 SL3

• SL03.9 km
• SL15.3 km
• SL25.6 km
• UB75.7 km
• SL45.9 km
• TW196.1 km
• UB86.7 km
• UB117.3 km
• TW67.8 km
• TW207.9 km
• TW188.5 km
• UB38.8 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids