| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (406) 487-50** | (406) 487-5000 - (406) 487-5098 | 76 |
| (406) 487-51** | (406) 487-5100 - (406) 487-5193 | 38 |
| (406) 487-52** | (406) 487-5225 - (406) 487-5225 | 1 |
| (406) 487-53** | (406) 487-5300 - (406) 487-5398 | 55 |
| (406) 487-54** | (406) 487-5400 - (406) 487-5498 | 62 |
| (406) 487-55** | (406) 487-5500 - (406) 487-5599 | 80 |
| (406) 487-56** | (406) 487-5600 - (406) 487-5622 | 2 |
| (406) 487-57** | (406) 487-5700 - (406) 487-5700 | 1 |
| (406) 487-59** | (406) 487-5900 - (406) 487-5999 | 55 |
US Phone Directory: (406) 487-5***
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