| Business | Phone |
| Guard Security 175 Anderson, Markham | (905) 471-9660 |
| Imperial Alarm Systems 80 Acadia Ave, Markham L3R 9V1 | (905) 948-9188 |
| Marigold Security Inc 20 Amber St #7, Markham L3R 5P4 | (905) 666-3344 |
| Magna Security Systems Inc 220 Royal Crest Crt, Markham L3R 9Y2 | (905) 946-2462 |
| Ness Security Inc 145 Royal Crest Crt, Markham L3R 9Z4 | (905) 477-7311 |
| North York Security Systems 116 Senator Reesor's Dr, Markham L3P 3E5 | (905) 472-2672 |
| Pure Energy 172 Bullock Dr #27, Markham L3P 7M9 | (905) 201-0241 |