| Business | Phone |
| Alarms Unlimited 177 Mills St, Malden 2148 | (781) 322-6296 |
| Central Dispatch Inc 99 Commercial St, Malden 2148 | (781) 000-1111 |
| Central Signal 101 Commercial St, Malden 2148 | (781) 321-9551 |
| Dynamark Security Ctr 231 Kennedy Dr, Malden 2148 | (781) 397-0125 |