| Business | Phone |
| Big Sky Security 3211 Hesper Rd, Billings 59102 | (406) 656-5030 |
| Billings Alarm Co Inc 3318 3rd Ave N # 102, Billings 59101 | (406) 245-7219 |
| Comtech//Restech 3320 Evening Star Dr, Billings 59106 | (406) 855-8537 |
| Security By Kenco 3416 1st Ave N, Billings 59101 | (406) 245-4946 |
| Montana Lock & Security Inc Billings 59101 | (406) 259-1700 |
| Kenco Enterprises Inc 3416 1st Ave N, Billings 59101 | (406) 245-5527 |