County Index - Co Down
- 10thstep.Com - Co Down - Newry
- 1st Klass Fire Protection Engineers (Bangor) Ltd - Co Down - Bangor
- 3 Interior Contracts - Co Down - Newry
- A & E Fire Services - Co Down - Newry
- A C T Conveyor Systems - Co Down - Newry
- A Caims - Co Down - Downpatrick
- A E D Metal Cutting Services - Co Down - Newtownards
- A F Crane Hire Ltd. - Co Down - Newry
- A F S Computing - Co Down - Bangor
- A F White - Co Down - Newtownards
- A G & J Crichton - Co Down - Bangor
- A Graham - Co Down - Bangor
- A H Magowan - Co Down - Downpatrick
- A I Plant Spares - Co Down - Newry
- A J Bingham - Co Down - Newry
- A J Kitchens - Co Down - Dromore
- A J Plumbing Supplies - Co Down - Banbridge
- A M B Plastics Ltd. - Co Down - Bangor
- A M Control Systems - Co Down - Bangor
- A N Dennison (Donaghadee) Ltd. - Co Down - Donaghadee
- A Palmer Plant Hire - Co Down - Newtownards
- A R B Ireland - Co Down - Ballynahinch
- A Reid - Co Down - Newtownards
- A Robinson & Son - Co Down - Newry
- A S Services Ltd - Co Down - Ballynahinch
- A Strain - Co Down - Newry
- A Total Security Service - Co Down - Ballynahinch
- A V S Manufacturing & Marketing Ltd. - Co Down - Newtownards
- A. C. Powerlines Ltd - Co Down - Ballynahinch
- A.J. Plumbing Supplies Ltd (Ballynahinch) - Co Down - Ballynahinch
- A1 Domestic Boiler Service & Installation - Co Down - Ballynahinch
- A1 Driveways & Building Services - Co Down - Dromore
- Abacus Business Forms Ltd. - Co Down - Newtownards
- Abbey Tiles - Co Down - Newtownards
- Abbeyview Engineering - Co Down - Downpatrick
- Abco Marine Ltd - Co Down - Hillsborough
- Abellio Group Ltd - Co Down - Newry
- Acheson Glover Brick & Paving Centre - Co Down - Newtownards
- Acorn Testing Services - Co Down - Dromore
- Acovox - Co Down - Downpatrick
- Adra Ltd - Co Down - Newtownards
- Adrian Griffiths - Co Down - Newtownards
- Advance Fasteners - Co Down - Hillsborough
- Advanced Plumbing & Heating - Co Down - Newtownards
- Advanced Vacuum & Lift - Co Down - Newtownards
- Advantage Chauffer Service - Co Down - Newry
- Aes Automation - Co Down - Downpatrick
- Ag-Con Products Ltd. - Co Down - Newry
- Agms Ltd - Co Down - Newry
- Agri Supplies - Co Down - Dromore
- Agri-Web Ltd - Co Down - Bangor
- Agrifood & Bio Science Institute of Northern Ireland - Co Down - Hillsborough
- Aidan Strain Electrical Engineering Ltd - Co Down - Newry
- Air Products Plc t/a Moyfab Engineering Ltd - Co Down - Newry
- Airtech Distribution Ltd - Co Down - Newtownards
- Aj Elite - Co Down - Newry
- Alan Crooks - Co Down - Newtownards
- Alan Cook Architects - Co Down - Bangor
- Alan Evans Associates - Co Down - Bangor
- Alan Tormey - Co Down - Downpatrick
- Albert Clarke - Co Down - Newtownards
- Aldor Control Systems - Co Down - Dromore
- Alex McBratney - Co Down - Downpatrick
- Alex Morton Contracts Ltd. - Co Down - Dromore
- Alex Warden - Co Down - Newtownards
- Alexander Hanna Ltd - Co Down - Newry
- Alexander Marketing - Co Down - Holywood
- Alfie Greer - Co Down - Dromore
- Ali Green Recycling - Co Down - Newry
- Alistair Morrison - Co Down - Downpatrick
- All About People - Co Down - Holywood
- All Aflame Ltd - Co Down - Newry
- Allmark (Ni) Ltd. - Co Down - Newry
- Alloy Wheel Fix - Co Down - Hillsborough
- Alpine Signs Ltd - Co Down - Newtownards
- Alternative Heat Ltd - Co Down - Castlewellan
- Amalgamated Environmental Services (A E S) Ltd. - Co Down - Newtownards
- Ambition Printing - Co Down - Holywood
- Ampec - Co Down - Bangor
- Anachem - Co Down - Newry
- Anchor Engineering - Co Down - Newry
- Andante Percussion - Co Down - Banbridge
- Anderson Smyth - Co Down - Dromore
- Andrew Davies Bakery - Co Down - Newry
- Andrew Devoy - Co Down - Newtownards
- Andrew Ingredients Ltd. - Co Down - Lisburn
- Andrews Metals & Plastics (Sued As A Firm) - Co Down - Downpatrick
- Anglo Beef Processors Ltd. - Co Down - Newry
- Animart Display - Co Down - Newtownards
- Anjo Wines Ltd - Co Down - Newry
- Anna Knox Jewellery - Co Down - Newtownards
- Annahilt Village Stores - Co Down - Hillsborough
- Annett Engineering - Co Down - Newry
- Annett Engineering Ltd - Co Down - Holywood
- Annies Country Crafts - Co Down - Newtownards
- Anthony O'Hare - Co Down - Newry
- Antiques & Interiors Warehouse - Co Down - Hillsborough
- Ap Mc Crory Engineering Ltd - Co Down - Newry
- Apaseal Ltd (Newry) - Co Down - Newry
- Aqua Lisa - Co Down - Newtownards
- Archem - Co Down - Holywood
- Archem (N.I.) Ltd - Co Down - Newtownards
- Ardill & Patterson Ltd - Co Down - Newtownards
- Ardnell Ltd - Co Down - Newry
- Ardnet Online Solutions - Co Down - Newtownards
- Ards Containers - Co Down - Newtownards
- Ards Crane Hire Ltd - Co Down - Bangor
- Ards Development Bureau & Community Network - Co Down - Newtownards
- Ards Flooring & Cleaning Supplies Ltd - Co Down - Newtownards
- Ards Fruit & Veg Wholesale - Co Down - Newtownards
- Ards Oil - Co Down - Newtownards
- Ards Rentall Ltd. - Co Down - Newtownards
- Ards Slings & Ropes - Co Down - Newtownards
- Ards Stainless Marine - Co Down - Newtownards
- Aremis Ltd - Co Down - Newry
- Armagh Down Bar - Co Down - Newry
- Armaghmourne Gas Company Ltd - Co Down - Newry
- Armatile Ltd (Newry) - Co Down - Newry
- Art & Framing - Co Down - Bangor
- Art & Home - Co Down - Holywood
- Art Engineering - Co Down - Newtownards
- Arthur Hollywood Designs - Co Down - Newtownards
- Arts & Community Development - Co Down - Newcastle
- Ashbury Video - Co Down - Bangor
- Ashleigh (N.I.) Ltd - Co Down - Ballynahinch
- Ashley Pine - Co Down - Ballynahinch
- Ashvale Engineering Ltd - Co Down - Downpatrick
- Associated Processors Ltd. - Co Down - Newtownards
- Atom Software - Co Down - Banbridge
- Aura Jewellery - Co Down - Newtownards
- Austin Matthews Agencies - Co Down - Newry
- Auto Stores - Co Down - Bangor
- Autopass - Co Down - Castlewellan
- Ax Board Ltd. - Co Down - Newry
- B B Blinds - Co Down - Newry
- B C Doors & Shutters - Co Down - Dromore
- B C Plant Ltd. - Co Down - Hillsborough
- B Dinsmore - Co Down - Newry
- B F Fitted Kitchens & Bedrooms - Co Down - Ballynahinch
- B G Interiors - Co Down - Newtownards
- B L Boiler Services - Co Down - Newry
- B M Engineering - Co Down - Newtownards
- B M F Agri - Co Down - Newtownards
- B P F Plant Ltd. - Co Down - Downpatrick
- B P F (Road Safety) Ltd - Co Down - Downpatrick
- B W T (N I) - Co Down - Newtownards
- B Wilson & Son - Co Down - Newry
- B.H. Hardware & Builders Suppiers Ltd - Co Down - Newry
- Backgammon Quality Cooked Meats - Co Down - Newtownards
- Baird Packaging - Co Down - Dromore
- Ball Bros - Co Down - Dromore
- Ballinaskeagh Grains Ltd. - Co Down - Banbridge
- Balloo Hire Centre Ltd. - Co Down - Bangor
- Balloo Metal Recycling Ltd - Co Down - Newtownards
- Ballyalton Cars - Co Down - Newtownards
- Ballyalton Farm Supplies - Co Down - Downpatrick
- Ballygowan Village Hall - Co Down - Newtownards
- Ballykine Steel Construction Ltd. - Co Down - Ballynahinch
- Ballyleidy Sawmills - Co Down - Newtownards
- Ballynahinch Pet Centre - Co Down - Ballynahinch
- Ballyrolly Construction - Co Down - Newtownards
- Ballytrain Plant & Commercial Sales N.I. Ltd - Co Down - Newry
- Ballytrim Sawmills Ltd - Co Down - Downpatrick
- Banbridge Bathroom Centre - Co Down - Banbridge
- Banbridge Coachworks Ltd. - Co Down - Banbridge
- Banbridge Coal Stores - Co Down - Banbridge
- Banbridge Fuel Services Ltd - Co Down - Banbridge
- Banbridge Hire & Sales - Co Down - Banbridge
- Banbridge Leader, The - Co Down - Banbridge
- Bangor Car Dismantlers - Co Down - Bangor
- Bangor Colour Copy Shop - Co Down - Bangor
- Bangor Fuels - Co Down - Bangor
- Bangor Fuels - Co Down - Bangor
- Bangor Locksmiths - Co Down - Bangor
- Bangor Skip Hire - Co Down - Newtownards
- Bann Caravans - Co Down - Banbridge
- Barbican Farms - Co Down - Newcastle
- Barbour Engineering Ltd. - Co Down - Bangor