- Abbots Langley - 2 companies
- Abbottabad - 1 company
- Aberaeron - 2 companies
- Aberdare - 17 companies
- Aberdeen - 283 companies
- Aberdeenshire - 9 companies
- Aberdeenshire - 1 company
- Aberfeldy - 2 companies
- Abergavenny - 14 companies
- Abergele - 3 companies
- Aberlour - 5 companies
- Abertillery - 10 companies
- Aberystwyth - 9 companies
- Abingdon - 66 companies
- Accrington - 77 companies
- Acrington - 1 company
- Addlestone - 14 companies
- Adlington - 1 company
- Ahmedabad - 1 company
- AIRDRIE - 24 companies
- Albert St - 1 company
- Albourne - 1 company
- Albourne, Nr. Hassocks - 1 company
- ALCESTER - 40 companies
- Aldeburgh - 1 company
- Alderley Edge - 7 companies
- Aldermaston - 6 companies
- Aldershot - 66 companies
- Aldford - 1 company
- Aldridge - 7 companies
- Aldrige - 1 company
- Alexandria - 3 companies
- Alford - 6 companies
- Alfreton - 64 companies
- Alfreton Road - 1 company
- Allentown - 1 company
- Alloa - 16 companies
- ALLTAMI - 1 company
- Almondsbury - 1 company
- Alness - 6 companies
- Alnwick - 6 companies
- Alperton - 1 company
- Alresford - 13 companies
- Alston - 1 company
- Altham - 3 companies
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