| Business | Phone |
| Security Armored Express Inc 143 Erie Dr, Billings 59101 | (406) 259-5150 |
| Security Consultants Group Inc 2900 4th Ave N, Billings 59101 | (406) 248-9061 |
| Dynamark Security Ctr 1015 Broadwater Ave, Billings 59102 | (406) 259-3614 |
| Excalibur Security Svc 1029 Kristin Dr, Billings 59101 | (406) 252-4473 |
| Photo Scan Northwest Inc 1033 S 29th St W # C, Billings 59102 | (406) 652-7137 |
| Northern Fire & Communications 1925 Grand Ave # 121, Billings 59102 | (406) 245-3500 |
| Integrated Security West 25 1/2 Foster Ln, Billings 59101 | (406) 896-1234 |
| Interstate Alarm Co Billings 59102 | (406) 652-4546 |