| Business | Phone |
| Napandon Communications 7370 Woodbine Ave, Markham L3R 1A5 | (905) 943-7632 |
| Bhc Cable 415 Hood Rd, Markham L3R 3W2 | (905) 470-9963 |
| Catech Systems Ltd 201 Whitehall Dr, Markham L3R 9Y3 | (905) 944-0000 |
| Data Connect Systems Group Inc 251 Amber St, Markham L3R 3J7 | (905) 944-9045 |
| David Contracting Group 7639 Reesor Rd, Markham L6B 1A8 | (905) 471-5262 |
| Ehv Power Corp 21 Cardico Dr, Markham | (905) 888-7266 |