| Business | Phone |
| Maximum Security Alarm Systems 637 Veterans Hwy, Smithtown 11787 | (631) 361-2013 |
| Elite Security System Inc Po Box 744, Smithtown 11787 | (631) 360-8144 |
| Ial Security Systems 500 W Jericho Tpke, Smithtown 11787 | (631) 724-1448 |
| International Home Safety Corp 550 Smithtown Byp, Smithtown 11787 | (631) 543-0128 |
| Sincerely Secure Inc 62 Leslie Ln, Smithtown 11787 | (631) 499-7963 |