| Business | Phone |
| Advanced Detection Systems Inc Danbury 6810 | (203) 797-9360 |
| Alarm King Central Inc 16 Lake Avenue Ext, Danbury 6811 | (203) 743-1721 |
| Silent Watchman Security Svc Danbury 6810 | (203) 743-1876 |
| Safe & Sound Alarm Systems 8 Cedar Dr, Danbury 6811 | (203) 748-0687 |
| Prompt Security Systems 19 Somers St, Danbury 6810 | (203) 967-4800 |
| Donnelly Security 31 Maple Ave, Danbury 6810 | (203) 790-8184 |
| Evans Alarm Co 15 Abbott Ave, Danbury 6810 | (203) 790-1733 |
| Homeguard Security Systems Danbury 6810 | (203) 744-6707 |