SL9 postcode district

Postcodes and sectors

872 of the district's 1,414 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 51.59813, -0.55573, which locates the district, not a building.

Companies registered in SL9

Companies House lists 3,763 companies with a registered office in SL9; 1,317 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 SL9

• Buckinghamshire
• South East
• Chalfont St Peter
• Gerrards Cross
• Tatling End
• Horn Hill
• Three Rivers
• Hertfordshire
• Eastern

Roads filed under SL9

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.

• Acrefield Road
• Amersham Road
• Ashlea Road
• Austenway
• Austenwood Close
• Austenwood Common
• Austenwood Lane
• Beacon Close
• Beech Waye
• Bench Manor Crescent
• Bentinck Close
• Birchdale
• Boundary Road
• Bramble Close
• Brawlings Lane
• Bull Lane
• Bulstrode Way
• By-Wood End
• Camp Road
• Cedars Close
• Cherry Acre
• Cherrytree Lane
• Chesham Lane
• Chestnut Close
• Chestnut Walk
• Cheyne Close
• Chiltern Hill
• Chipstead
• Churchfield Road
• Church Lane
• Claydon End
• Claydon Lane
• Cleland Road
• Coombe Vale
• Copper Ridge
• Copthall Close
• Copthall Corner
• Copthall Lane
• Cordon's Close
• Criss Grove
• Croft Close
• Croft Road
• Cross Lanes
• Cross Lanes Close
• Dale Side
• Deanacre Close
• Deancroft Road
• Denham Lane
• Denham Walk
• Denmead Close
• Donnay Close
• Drummond Crescent
• Dukes Close
• Dukes Kiln Drive
• Dukes Lane
• Dukes Ride
• Dukes Valley
• Dukes Wood Avenue
• Dukes Wood Drive
• East Common

Check an address in SL9

Check an address in SL9

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SL9" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SL9

What does an SL9 postcode tell you?

That the address lies in the SL9 district of the SL (Slough) postcode area, and the place OS Open Names most often lists first for its postcodes is Chalfont St Peter. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 872 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 SL9

• HP84.5 km
• UB94.6 km
• HP96.0 km
• WD37.4 km
• SL27.8 km
• HP78.3 km
• SL08.5 km
• UB109.0 km
• UB89.0 km
• HA69.3 km
• HP69.4 km
• HP109.9 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids