| Company Name | City | License |
|---|---|---|
| ABT Controls | Missoula | |
| ABC Seamless | Missoula | |
| Abatement Contractors of Montana | Missoula | |
| AAA Plumbing and Heating | Frenchtown | |
| AAA Construction of Missoula | Missoula | |
| A.P. Roofing and Construction | Helena | |
| A-Core of Missoula | Missoula | |
| A&E Design | Missoula | |
| 64 Mile Distillery | Anaconda | |
| 4G Plumbing and Heating, Inc | Missoula | |
| 406 Mudworx LLC | Missoula | |
| 3B Rehabilitation Services LLC | Helena | |
| 3 Rivers Landworks | Clinton | |
| 2M Company | Missoula |