| Business | Phone |
| Black Hawk 404 N 31st St # 105, Billings 59101 | (406) 247-8741 |
| Cline Production Co 2812 1st Ave N # 403, Billings 59101 | (406) 254-9496 |
| Onyx Oil Co 2812 1st Ave N, Billings 59101 | (406) 256-9000 |
| Great Northern Drilling Co 1643 Lewis Ave # 200, Billings 59102 | (406) 252-4658 |
| Nyvatex Oil Corp 3021 6th Ave N # 211, Billings 59101 | (406) 252-3429 |
| Kykon Oil & Gas Inc 100 N 27th St # 240, Billings 59101 | (406) 248-3757 |