SL4 postcode district

Postcodes and sectors

1,376 of the district's 2,142 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 51.47534, -0.62761, which locates the district, not a building.

Companies registered in SL4

Companies House lists 4,989 companies with a registered office in SL4; 1,102 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 SL4

• South East
• Windsor and Maidenhead
• Windsor
• Old Windsor
• Bracknell Forest
• Eton
• Eton Wick
• Cranbourne
• Buckinghamshire
• Woodside
• Plaistow Green
• Dorney
• The Village
• Oakley Green
• Winkfield Street
• Winkfield
• Water Oakley
• Maiden's Green
• Boveney
• Lake End
• Runnymede
• Surrey
• Wraysbury
• Slough

Roads filed under SL4

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.

• Abbot's Walk
• Acre Passage
• Addington Close
• Adelaide Square
• Albany Road
• Albert Place
• Albert Road
• Albert Street
• Alden View
• Alexandra Road
• Allkins Court
• Alma Road
• Almond Close
• Andermans
• Arthur Road
• Ashbrook Road
• Ashford Lane
• Ash Lane
• Aston Mead
• Athlone Square
• Aylesworth Spur
• Bachelors Acre
• Badgersbridge Ride
• Bailey Close
• Baldwin's Shore
• Ballard Green
• Balmoral Gardens
• Bann Way
• Barrack Lane
• Barry Avenue
• Basford Way
• Beaumont Road
• Bell Lane
• Bell View
• Bell View Close
• Benning Close
• Berkeley Drive
• Bexley Street
• Birch Grove
• Birchington Road
• Bishop's Lane
• Bishops Farm Close
• Black Horse Close
• Bolton Avenue
• Bolton Crescent
• Bolton Road
• Bourne Avenue
• Boveney New Road
• Boveney Road
• Bradshaw Close
• Braziers Lane
• Bridgeman Drive
• Bridgewater Terrace
• Bridgewater Way
• Broadway
• Brocas Street
• Broken Furlong
• Brook Street
• Bruce Walk
• Brudenell

Check an address in SL4

Check an address in SL4

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SL4" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SL4

What does an SL4 postcode tell you?

That the address lies in the SL4 district of the SL (Slough) postcode area, and the place OS Open Names most often lists first for its postcodes is Windsor. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,376 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 SL4

• SL14.7 km
• SL35.9 km
• SL26.9 km
• TW207.4 km
• SL607.7 km
• SL58.1 km
• SL68.9 km
• GU259.1 km
• TW199.3 km
• SL09.5 km
• TW1810.0 km
• RG4210.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids