- C Zang Engineering Ltd - DH9 8UR
- Classic Windows - DH9 9NX
- Con Mech Engineers Ltd - DH9 8UR
- D & C Electronics Ltd - DH9 8HY
- Doby Verrolec - DH9 8UJ
- Dyer Engineering Ltd - DH9 7RU
- EMC Testing UK - DH9 8UJ
- Glazing Films & Blinds - DH9 9UU
- Greencroft Bottling - DH9 7XP
- H&C Joinery - DH9 7RU
- Image Flood Defence Ltd - DH9 0UJ
- Industrial Pattern Makers - DH9 9XA
- K P Snacks - DH9 9XS
- Marmax Products Ltd - DH9 9QX
- Martel Instruments Ltd - DH9 9XG
- Nicholsons - DH9 7YE
- Osborne Construction Estimating - DH9 8BH
- Protocol Engineering Ltd - DH9 9XB
- Rasmi Electronics Ltd - DH9 7RX
- SK Plastics Ltd - DH9 9XB
- T S E C Ltd - DH9 9XA
- Tanfield Engineering - DH9 9NX
- Tosoh Quartz Inc - DH9 7YB