| Business | Phone |
| Accu-Arm Security Inc 77 Yongehurst Rd, Richmond Hill L4C 3T3 | (905) 883-6360 |
| Alliance Security Systems 27 Aranka Crt, Richmond Hill L4C 7V2 | (905) 884-4222 |
| H & L Alarm Systems Ltd 93 Theobalds Cir, Richmond Hill L4C 9E1 | (905) 508-7739 |
| Halt Security Systems Inc 40 Vogell Rd #57, Richmond Hill L4B 3N6 | (905) 770-1182 |
| Northern Alarm Protection Co 556 Edward Ave, Richmond Hill L4C 9Y5 | (905) 883-0215 |
| On Guard Security Systems 151 Berwick Cres #16, Richmond Hill L4C 0B5 | (905) 737-7367 |
| Prime Security Systems Inc 191 Silver Linden Dr, Richmond Hill L4B 4G6 | (905) 763-5933 |
| Tda Secure Access Inc 588 Edward Ave, Richmond Hill L4C 9Y6 | (905) 780-7700 |
| Tri-Cell Communications 9737 Yonge St, Richmond Hill L4C 8S7 | (905) 770-1010 |
| Eastern Security Systems Inc 588 Edward Ave #35, Richmond Hill L4C 9Y6 | (905) 884-3542 |
| Custom Homes Security Systems 67 Misty Moor, Richmond Hill L4C 6P9 | (905) 889-2966 |
| Custom Signal 66 Oak Ave, Richmond Hill L4C 6R7 | (905) 886-4718 |