| Business | Phone |
| Greater Alarm Co Inc 22440 Temescal Canyon Rd, Corona 92883 | (951) 277-1253 |
| Lakewood Alarm 1141 Pomona Rd # K, Corona 92882 | (951) 278-5640 |
| Excel Security Systems Inc 2740 Hudson Ave, Corona 92881 | (951) 738-9614 |
| Lakewood Alarm Inc 2621 Green River Rd # 105-220, Corona 92882 | (562) 630-4623 |
| Marathon Security Systems Corona 92879 | (951) 371-2704 |
| Scn-Security Communication 1705 Rimpau Ave, Corona 92881 | (951) 371-3208 |
| Total Vue Electronics 1979 S Sundance Cir, Corona 92879 | (951) 371-1400 |