| Business | Phone |
| Alarmex Inc 243 Boston St, Topsfield 1983 | (978) 887-2999 |
| Sos Security Systems 10 S Main St # 104, Topsfield 1983 | (978) 887-8341 |
| Red Alert Security Systems 13 Stagecoach Rd, Topsfield 1983 | (978) 887-9504 |
| Hi-Tech Security Systems 25 Wildes Rd, Topsfield 1983 | (978) 887-8772 |