| Business | Phone |
| Adt Security Svc 861 Consortium Crt, London N6E 2S8 | (519) 680-3570 |
| Aitc Security Inc 2018 Mallard Rd #10, London N6H 5L8 | (519) 473-4238 |
| Alarmtech Security Systems 549 Huron St, London N5Y 4J6 | (519) 434-3996 |
| Alarmforce 1288 Commissioners Rd W, London N6K 1E1 | (519) 657-3835 |
| Alliance Security Systems 160 Adelaide St S #A, London N5Z 3L1 | (519) 680-0540 |
| Astro-Guard Security Systems 343 Wellington Rd, London N6C 4P8 | (519) 438-2144 |
| Tritech Security Inc 652 Lorne Ave, London N5W 3K5 | (519) 452-3310 |
| Burglar Guard Ltd 133 Brisbin St, London N5Z 2L9 | (519) 453-1252 |
| Burtek Ssi 4151 Perkins Rd, London N6L 1G8 | (519) 652-9200 |
| Can-Tech Security Svc 9 Wendy Cres, London N5X 3C6 | (519) 675-9912 |
| Casob Security Svc 1274 Limberlost Rd, London N6G 3A5 | (519) 473-7896 |
| Chubb Security Systems 588 Newbold St, London N6E 2W9 | (519) 668-6800 |
| Coyote Communications 18 Alayne Cres, London N6E 2A3 | (519) 686-7695 |
| Digitech Security Systems 382 Ferndale Ave, London N6C 2Y8 | (519) 649-0083 |