- Abbots Langley - 2 companies
- Abbotskerswell - 1 company
- Aberaeron - 2 companies
- Aberdare - 17 companies
- Aberdeen - 335 companies
- Aberdeenshire - 10 companies
- Aberdeenshire - 1 company
- Aberfeldy - 2 companies
- Abergavenny - 17 companies
- Abergele - 3 companies
- Aberlour - 5 companies
- Abertillery - 10 companies
- Aberystwyth - 9 companies
- Abingdon - 77 companies
- Accrington - 94 companies
- Acrington - 1 company
- Addlestone - 15 companies
- Adlington - 1 company
- Agadir - 1 company
- AIRDRIE - 28 companies
- Albert St - 1 company
- Albourne - 1 company
- Albourne, Nr. Hassocks - 1 company
- ALCESTER - 44 companies
- Aldeburgh - 1 company
- Alderley Edge - 9 companies
- Aldermans Green - 1 company
- Aldermaston - 7 companies
- Aldershot - 76 companies
- Aldford - 1 company
- Aldridge - 9 companies
- Aldrige - 1 company
- Aldwick - 1 company
- Alexandria - 3 companies
- Alferton - 1 company
- Alford - 7 companies
- Alfreton - 77 companies
- Alfreton Road - 1 company
- Allentown - 1 company
- Allesley - 1 company
- Alloa - 17 companies
- ALLTAMI - 2 companies
- Almondsbury - 1 company
- Alness - 6 companies
- Alnwick - 10 companies
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