| Business | Phone |
| A & M Security 101 Elliott Ave W 580, Seattle 98119 | (206) 838-5824 |
| Affordable Monitoring Po Box 84225, Seattle 98124 | (206) 528-5667 |
| Alarm Monitoring & Repair Seattle 98125 | (206) 361-6198 |
| Alexander Security Svc Inc 311 1st Ave S, Seattle 98104 | (206) 550-0300 |
| Allied Security Equipment 5901 4th Ave S, Seattle 98108 | (206) 767-2500 |
| American Veterans Security Seattle 98104 | (206) 381-1676 |
| Anitian Enterprise Security 12735 39th Ave Ne, Seattle 98125 | (206) 937-6072 |
| Ballard Security Inc 2825 Nw Market St # 211, Seattle 98107 | (206) 264-2435 |
| C & R Electric Inc 919 Sw 150th St A, Seattle 98166 | (206) 937-3654 |
| Castle Rock Security Group 1249 Ne 145th St, Seattle 98155 | (206) 440-0951 |
| Cook Security Group Inc 914 Industry Dr, Seattle 98188 | (425) 264-0415 |
| Upgrade International Corp 601 Union St 4200, Seattle 98101 | (206) 903-3116 |
| Electro Vox Intercom-Seattle 10710 Stone Ave N 2, Seattle 98133 | (206) 285-4620 |
| Entrance Controls Inc 664 Industry Dr, Seattle 98188 | (206) 622-0452 |
| Guardian Security 1743 1st Ave S, Seattle 98134 | (206) 622-2220 |
| I 5 Security Inc 2825 Nw Market St, Seattle 98107 | (206) 782-8493 |
| In-Store Technology Llc 220 S Findlay St, Seattle 98108 | (206) 709-0125 |
| Jem Security Svc 7006 55th Ave Ne, Seattle 98115 | (206) 525-1221 |