| Office | Address | City | State | Postal Code | Phone | FAX | |
|---|---|---|---|---|---|---|---|
| Local Office | 145 Geyser Street | West Yellowstone | MT | 59758 | 406-646-4437 | 406-646-4830 | Montana Customer Service |
| Business Office | 145 Geyser Street | West Yellowstone | MT | 59758 | 406-646-4437 | 406-646-4830 | Montana Customer Service |
| Billing and Credit | 1 1st Ave S | Great Falls | MT | 59401 | 406-791-7510 | 406-791-7560 | Montana Customer Service |
| Billing and Credit | 1 1st Ave S | Great Falls | MT | 59401 | 800-570-5688 | 406-791-7560 | Montana Customer Service |
| Emergency Service, Leaks, No Heat | 406-646-4437 | Montana Customer Service | |||||
| Before you Dig Line Location | 800-424-5555 | Montana Customer Service | |||||
| Mailing Address | P.O. Box 582 | West Yellowstone | MT | 59758 | Montana Customer Service |
