Telephone Code Index - 01678
| 540389 | A & R Jones - Bala |
| 520455 | A W Jones & A E - Bala |
| 520660 | AG Evans and Sons - Llanrwst |
| 530297 | Cwmna Gro Ltd - Llanrwst |
| 520348 | D B & N J Aykroyd Ltd. - Bala |
| 540254 | David H Williams - Bala |
| 520483 | Dewa E Davies - Bala |
| 521595 | E W Jones (Plant Hire) Ltd. - Bala |
| 520356 | G & E Jones - Bala |
| 530415 | Gro Cycles & Fishing Ltd - Bala |
| 540661 | Gwynfor Jones-Williams - Bala |
| 520896 | H W Jones - Bala |
| 530249 | I G & R E Roberts - Bala |
| 520331 | I Hughes - Bala |
| 530235 | I V Jones - Bala |
| 520574 | J D Evans - Bala |
| 520416 | Jones T & Sons - Bala |
| 520311 | Jones & Evans - Bala |
| 521000 | Professional Personnel Consultants - Bala |
| 520376 | S E & H P Edwards - Bala |
| 540639 | S J Owen & Co - Bala |
| 520906 | Saracens Tyre Service - Llanrwst |
| 521427 | Scanwel - Bala |
| 530281 | Scanwel Ltd. - Bala |
| 530280 | T P Rowlands & Son - Bala |
| 520126 | The Berwyn Bakery Ltd. - Bala |
| 520262 | The County Press - Bala |
| 530372 | Ysgubor Builders - Corwen |