AL3 postcode district

Postcodes and sectors

955 of the district's 1,309 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 51.78047, -0.37772, which locates the district, not a building.

Companies registered in AL3

Companies House lists 2,896 companies with a registered office in AL3; 860 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 AL3

• Eastern
• Hertfordshire
• St. Albans
• St Albans
• Dacorum
• Redbourn
• Markyate
• Flamstead
• Trowley Bottom
• Friar's Wash
• Roe End
• Childwick Green
• Sandridge
• Holtsmere End
• Aley Green
• Central Bedfordshire

Roads filed under AL3

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.

• Abbey Avenue
• Abbey Mill End
• Abbey Mill Lane
• Abbey View Road
• Adelaide Street
• Akeman Close
• Alban Avenue
• Albert Street
• Allandale
• Alverton
• Amberley Grove
• Antonine Gate
• Appletree Grove
• Arretine Close
• Artisan Crescent
• Arundel Grove
• Ashwell Street
• Aubrey Lane
• Augustus Close
• Avocet Close
• Aysgarth Road
• Bakers Yard
• Bakery Mews
• Bartholomew Green
• Bassett Close
• Batchwood Drive
• Batchwood Gardens
• Batchwood View
• Beaumont Hall Lane
• Beckett's Avenue
• Becks Close
• Bedmond Lane
• Beech Bottom
• Beechfield Close
• Beech Place
• Beech Road
• Beechtree Lane
• Ben Austins
• Bernard Street
• Bettespol Meadows
• Birchmead Close
• Black Cat Close
• Blackhorse Lane
• Blacksmith's Lane
• Blenkin Close
• Blueberry Close
• Bluehouse Hill
• Blundell Close
• Boot Alley
• Bowes Lyon Mews
• Brache Close
• Branch Road
• Bridle Close
• Brinklow Court
• Britton Avenue
• Brooke End
• Buckwood Road
• Caddington Common
• Caelian Place
• Camlet Way

Check an address in AL3

Check an address in AL3

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=AL3" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about AL3

What does an AL3 postcode tell you?

That the address lies in the AL3 district of the AL (St Albans) postcode area, and the place OS Open Names most often lists first for its postcodes is St Albans. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 955 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 AL3

• AL54.3 km
• AL15.1 km
• HP25.4 km
• AL45.8 km
• AL27.4 km
• HP18.1 km
• HP38.2 km
• WD59.0 km
• WD49.9 km
• AL1010.2 km
• WD2510.4 km
• LU111.0 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids