| Company Name | City | License |
|---|---|---|
| Western States Cat Rental Butte | Missoula | |
| Western States Cat Rental Kalispell | Kalispell | |
| Western States Cat Rental Missoula | Missoula | |
| Western States Fire Protection | Missoula | |
| Westslope Forest Management Inc | Frenchtown | |
| WGM Group | Missoula | |
| Wilbert Precast, Inc. | Spokane | |
| Wildhorse RV Resort | Big Arm | |
| Williams Plumbing and Heating | Belgrade | |
| Wm. Winkler Company | Newman Lake | |
| WMK Company | Seeley Lake | |
| WMK Company, Inc | Billings | |
| Woith Engineering | Missoula | |
| Woodhawk Controls | Coeurdalene | |
| Woods Crushing & Hauling | Sandpoint | |
| Yellowstone National Park Lodges | Mammoth | |
| Yost Gallagher Construction | Spokane | |
| Zip Beverage | Missoula |