All Industry companies in Holyhead
- All Sewn Up - Holyhead
- Anglesey Aluminium Metal Ltd. - Holyhead
- Anglesey Garden Ornaments - Holyhead
- Anglesey Mould & Press Ltd. - Holyhead
- Anglesey Signs - Holyhead
- Aqua Hygiene Products Ltd - Holyhead
- Bargains Galore - Holyhead
- Bridge Security Systems Ltd - Holyhead
- Build Center (Holyhead) - Holyhead
- Careers Wales North West - Holyhead
- Carlton Blinds (Cymru) Ltd - Holyhead
- Carltons Blinds - Holyhead
- Charles Dodd & Co. - Holyhead
- ChemRegs (UK) Ltd - Holyhead
- Cocon Construction Ltd. - Holyhead
- Condessa - Holyhead
- Copperfield Gifts - Holyhead
- County Bakery - Holyhead
- County Discount Tiles - Holyhead
- Davies Hardware - Holyhead
- Diving Services (Anglesey) - Holyhead
- E M Pritchard - Holyhead
- E W Parry & Sons - Holyhead
- Eifions Coaches Ltd. - Holyhead
- Energy Assessment Solutions Ltd - Holyhead
- Ernest Gibbons - Holyhead
- G & H M Pritchard - Holyhead
- Gareth Jones Transport - Holyhead
- Goodsir Coach Depot - Holyhead
- Graig Fawr Feeds - Holyhead
- Grays Waste Management Ltd - Holyhead
- Gwynedd Shipping (Northern) Ltd - Holyhead
- Holyhead Boatyard Ltd. - Holyhead
- Huws Gray (Holyhead) - Holyhead
- J H Campbell & Sons - Holyhead
- Jewson Hirepoint (Holyhead) - Holyhead
- Jewson Tool Hire (Holyhead) - Holyhead
- Jobcentre Plus (Holyhead) - Holyhead
- Joseph Keegan & Sons Ltd - Holyhead
- Kellings Dog Coats - Holyhead
- Kells Stainless (Uk) Ltd - Holyhead
- Kitchen & Bathroom Collection - Holyhead
- Kleiser's of Holyhead - Holyhead
- Llynon Windmill - Holyhead
- Looms Bros - Holyhead
- LS Printworks - Holyhead
- M P Williams Industrial Vehicle Repairers - Holyhead
- M W Thomas - Holyhead
- Martins Models - Holyhead
- Mon Maintenance Services Ltd - Holyhead
- Mona Fuel & Trading Co. Ltd. - Holyhead
- Mouse Sails Point North - Holyhead
- Newry Stores - Holyhead
- North Wales Tourism - Cwmni Twristiaeth Gogledd Cymru (Holyhead) - Holyhead
- North Wales Welding Supplies - Holyhead
- Nursery Days - Holyhead
- O R & W H Parry - Holyhead
- Owen Pierce & Sons - Holyhead
- Penrhos Hire & Sales Ltd - Holyhead
- Practical Princess Ltd. - Holyhead
- Premier Late Shop Ltd - Holyhead
- Professional Fabrication Services Ltd - Holyhead
- Quickmix Cocrete - Holyhead
- R & A Jones - Holyhead
- R H & M M Hughes - Holyhead
- Red Rock Grafix - Holyhead
- Serendipity Cards & Gifts - Holyhead
- Solitaire Marine Services - Holyhead
- Steel Fabrication & Engineering Ltd - Holyhead
- T R Jones & Sons Ltd - Holyhead
- T Richard Evans - Holyhead
- The Aluminium Powder Co Ltd (Holyhead) - Holyhead
- V F Engineering Ltd - Holyhead
- W I Hughes - Holyhead
- William E Hughes - Holyhead
- William Lloyd - Holyhead
- William Lynes Arthur - Holyhead
- Williams Potatoes - Holyhead
- Wynnstay Group P.L.C. (Holyhead) - Holyhead
- Xpose Media Ltd. - Holyhead
- Yacht Shop - Holyhead
- Ynys Mon Home Deliveries Ltd - Holyhead