Telephone Code Index - 01992
| 554552 | Britsoft Ltd. - Hertford |
| 653113 | Cellpak Solutions Ltd - Waltham Abbey |
| 462307 | ESC Steel Rule Dies - Hoddesdon |
| 702470 | Kendon Packaging Group Plc - Enfield |
| 656950 | ODN Logistics Solutions Ltd - Waltham Abbey |
| 890597 | Premier Minibuses - Waltham Abbey |
| 479470 | Stronghold International Ltd. - Hoddesdon |