Communications & Networking in Harpenden
| Telephone & Broadband Engineer 0800 411 8808 | Harpenden, Hertfordshire AL5 4SU Station Road | Call NowDetails |
| Boxer Systems 01582 466100 | Harpenden, Hertfordshire AL5 4UT 4-5 Allied Business Centre | Call NowDetails |
| 2 Circles Communications 0345 620 0200 | Redbourn, Hertfordshire AL3 7LE 3.0 mi High Street 23 | Call NowDetails |
| Trust Networks 01727 867919 | St Albans, Hertfordshire AL3 6PF 3.7 mi Unit 12 Stanta Business Centre | Call NowDetails |
| Automated Telecoms 0845 330 3303 | St Albans, Hertfordshire AL1 1EX 5.6 mi Holywell Hill | Call NowDetails |
| Comsys Satelite Communications Consultancy 01727 832288 | St Albans, Hertfordshire AL1 1BX 5.7 mi Holywell Hill 42 | Call NowDetails |
| Galaxy Telecom 01442 807060 | Hemel Hempstead, Hertfordshire HP2 7DX 7.0 mi Maxted Road 575-599 | Call NowDetails |
| NBM Technology Solutions 01442 838500 | Hemel Hempstead, Hertfordshire HP2 7DU 7.2 mi Eastman Way | Call NowDetails |
| Kingston Communications 01908 442000 | Hemel Hempstead, Hertfordshire HP2 7DS 7.6 mi Wood Lane End | Call NowDetails |
| Telecom Express 01707 226550 | Hatfield, Hertfordshire AL10 9NA 8.4 mi Bishops Close | Call NowDetails |
| Clearlink Telecoms & Data 01707 664905 | London Colney, Hertfordshire AL2 1JG 9.0 mi Alexander Road | Call NowDetails |
| Signature Networks 01442 818244 | Hemel Hempstead, Hertfordshire HP2 5BS 9.6 mi Alexandra Road 17 | Call NowDetails |
| Bt Telephone Exchange | Welwyn Garden City, Hertfordshire AL8 6PH 9.8 mi Wigmores North 40 | Details |
| Astra Telecom 07973 675397 | Hatfield, Hertfordshire AL10 8LB 10.0 mi 13 The Wades | Call NowDetails |
| ACT Telecom 01582 380001 | Hemel Hempstead, Hertfordshire HP1 1DS 10.1 mi Waterhouse Street | Call NowDetails |
| Open-link Technology 0870 050 0771 | Hemel Hempstead, Hertfordshire HP2 4TN 10.2 mi Selden Hill 1 | Call NowDetails |
| Blizzard Telecom 01442 933333 | Hemel Hempstead, Hertfordshire HP2 4TN 10.2 mi Selden Hill 1 | Call NowDetails |
| Network Billing Services 0800 508 8880 | Hemel Hempstead, Hertfordshire HP2 4TN 10.2 mi Selden Hill 1 | Call NowDetails |
| Talk King Business 0800 470 0282 | Luton, Bedfordshire LU2 0HS 10.2 mi Midland Road | Call NowDetails |
| L D Communications 01582 391668 | Luton, Bedfordshire LU2 0DZ 10.3 mi Oxen Road | Call NowDetails |