| Business | Phone |
| Worcester County Security Syst Worcester 1609 | (508) 756-6900 |
| American Alarm & Communication 70 Green St, Worcester 1604 | (508) 753-1322 |
| Arco Alarm Co 36 Butler St, Worcester 1607 | (508) 755-0919 |
| Adt Security Svc 345 Greenwood St, Worcester 1607 | (508) 421-5300 |
| Millennium Alarm Co Worcester 1604 | (508) 756-4100 |
| Summit Security Systems Worcester 1606 | (508) 852-4737 |
| Comsec Narragansett Security 10 Harvard St, Worcester 1609 | (508) 753-7274 |
| Kirb Service Ltd 36 Butler St, Worcester 1607 | (508) 366-5560 |
| Knight Inc 11 Santuit Ln, Worcester 1609 | (508) 756-5191 |
| Safeway Alarm & Security 80 Salisbury St, Worcester 1609 | (508) 753-5701 |
| Sentinel Security Systems 409 Shrewsbury St, Worcester 1604 | (508) 753-7799 |
| Creative Management 1 Coes Sq, Worcester 1603 | (508) 799-5450 |
| Dependable Alarms 3 Oakwood Ln, Worcester 1604 | (508) 792-1931 |
| Electronic Security Group Inc 1 Suffolk St, Worcester 1604 | (508) 753-4321 |
| Ftb Security Systems Worcester 1608 | (508) 798-0123 |
| Electronic Security Group Inc 2 Gilman St, Worcester 1605 | (508) 753-4321 |