| Business | Phone |
| Akal Security Inc 315 N 26th St, Billings 59101 | (406) 256-0615 |
| Alpha House 104 N 31st St, Billings 59101 | (406) 259-2109 |
| Securitas Security Svc Usa Inc 15 N 26th St # 301, Billings 59101 | (406) 245-9824 |
| Dnd Security 1706 Canary Ave, Billings 59101 | (406) 245-9541 |
| Guardian Security & Pi Po Box 80633, Billings 59108 | (406) 656-8646 |