| AL1 1XB | Kestronics Ltd - St Albans |
| AL1 2HA | Assetware Technology Ltd. - St Albans |
| AL1 3AW | Netcel Ltd. - St Albans |
| AL1 3HL | Computer People Group Plc - St Albans |
| AL1 5FL | Intelligent People Ltd - St Albans |
| AL1 5HT | Meteor Communications (Europe) Ltd - St Albans |
| AL10 0RN | Computer Aided Business Systems Ltd. - Hatfield |
| AL2 2DQ | Viglen Technology Ltd. - St Albans |
| AL2 3LL | Prosoft Systems - St Albans |
| AL3 5BH | Streamline Connections Ltd - St Albans |
| AL3 5DL | Webwide Translations Ltd - St Albans |
| AL3 5RR | Culver Consultancy Ltd - St Albans |
| AL3 6DA | Jackson Kent Associates Ltd. - St Albans |
| AL3 6EN | Enterprise Ab Ltd. - St Albans |
| AL3 7BN | Gillissa Ltd. - St Albans |
| AL3 7PR | Datalogic Scanning Ltd - Redbourn |
| AL3 8JP | Service Logic Ltd - Redbourn |
| AL4 0JX | FS Cables - St Albans |
| AL4 0XP | Computer Wizard - St Albans |
| AL4 0ZL | Haverly Systems Europe Ltd - St Albans |
| AL4 8RE | Business Interface Ltd. - St Albans |
| AL5 2JP | DirectNet Computers Ltd - Harpenden |
| AL5 3NS | IpEndpoints - Harpenden |
| AL5 4ES | Trapeze Group (UK) Ltd - Harpenden |
| AL6 0UW | Logistical Support Ltd - Welwyn Garden City |
| AL6 9NP | Spectral Dynamics (UK) Ltd - Welwyn Garden City |
| AL7 1AN | Identifile Systems Ltd. - Welwyn Garden City |
| AL7 1JG | TM Robotics (Europe) Ltd - Welwyn Garden City |
| AL7 1JU | Rotech Machines Ltd - Welwyn Garden City |
| AL7 1SA | Silver Fox Ltd - Welwyn Garden City |
| AL8 6NH | Point One (U K) Ltd. - Welwyn Garden City |
| AL8 6NT | Tristar Web Solutions Ltd. - Welwyn Garden City |
| AL9 5HZ | Clearview Systems - Hatfield |
