County Index - Londonderry
- AB Computers - Londonderry - Londonderry
- Albert Atkins - Londonderry - Coleraine
- Auswood Joinery - Londonderry - Magherafelt
- Blackhill Joinery - Londonderry - Limavady
- Brian Baird Architect - Londonderry - Coleraine
- Campsie Karting Centre - Londonderry - Londonderry
- Castleroe Precast Concrete - Londonderry - Coleraine
- CFM - Londonderry - Magherafelt
- Cloane Fireplaces - Londonderry - Magherafelt
- Coastal Self Drive - Londonderry - Coleraine
- Cohen Cramer Solicitors - Londonderry - Leeds
- Cottage Conservatories - Londonderry - Londonderry
- Creative Studio Glass Design Ltd - Londonderry - Londonderry
- Dallat Group - Londonderry - Coleraine
- Delap and Waller Ltd - Londonderry - Londonderry
- Design and Survey - Londonderry - Londonderry
- ECIS - Londonderry - Londonderry
- Elss Enginnering Ltd - Londonderry - Limavady
- Emergency Aid Supplies Ltd - Londonderry - Londonderry
- Farlow Engineering - Londonderry - Coleraine
- Foyle Communications - Londonderry - Londonderry
- Gloves4Less - Londonderry - Limavady
- H Kane and Son - Londonderry - Coleraine
- Henderson Fire Places - Londonderry - Magherafelt
- IEB Software - Londonderry - Londonderry
- Intertech NI Ltd - Londonderry - Londonderry
- J Fulton and Co - Londonderry - Magherafelt
- JCM Training Services - Londonderry - Magherafelt
- Johnston Printing Ltd - Londonderry - Coleraine
- Joseph Henry and Sons - Londonderry - Coleraine
- JSR Technology Ltd - Londonderry - Portrush
- Kennedy Quarries Ltd - Londonderry - Coleraine
- Kevin Mcglinchey - Londonderry - Londonderry
- McCloskey and O'Kane Building Co Ltd - Londonderry - Londonderry
- McDonnell Design - Londonderry - Londonderry
- MCL Ltd - Londonderry - Londonderry
- Minstrel Metalcraft Co - Londonderry - Magherafelt
- Moyola Building ServicesLtd - Londonderry - Magherafelt
- Nitec Auto Repairs - Londonderry - Coleraine
- North West Lawnmowers Ltd - Londonderry - Londonderry
- North West Window Blinds - Londonderry - Londonderry
- Northern Ultraseal - Londonderry - Magherafelt
- PC Patrol - Londonderry - Londonderry
- PPSL (Precision Processing Services Ltd) - Londonderry - Londonderry
- Practically Green Environmental Services - Londonderry - Magherafelt
- Prescut Engineering - Londonderry - Magherafelt
- Pumasource - Londonderry - Londonderry
- Rainvault - Rain Harvesting Systems - Londonderry - Magherafelt
- Retail Systems Technology Ltd - Londonderry - Londonderry
- Robinson Bros - Londonderry - Londonderry
- Rockfield Pig Breeders - Londonderry - Magherafelt
- RTS Plant - Londonderry - Coleraine
- Scott and Stinson Engineering - Londonderry - Coleraine
- Smyth Steel Ltd - Londonderry - Coleraine
- Sperrin Switchgear - Londonderry - Magherafelt
- Toptours Ireland - Londonderry - Londonderry
- Total Engineering - Londonderry - Londonderry
- Vin-Dec - Londonderry - London
- W Canning Concrete - Londonderry - Londonderry