| | Ravalli County | MT | 30081 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=RavalliCounty+MT |
| | Richland County | MT | 30083 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=RichlandCounty+MT |
| | Roosevelt County | MT | 30085 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=RooseveltCounty+MT |
| | Rosebud County | MT | 30087 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=RosebudCounty+MT |
| | Sanders County | MT | 30089 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=SandersCounty+MT |
| | Sheridan County | MT | 30091 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=SheridanCounty+MT |
| | Silver Bow County | MT | 30093 | | Butte-Silver Bow, MT 15580 | | Central | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=SilverBowCounty+MT |
| | Stillwater County | MT | 30095 | | Billings, MT 13740 | | Outlying | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=StillwaterCounty+MT |
| | Sweet Grass County | MT | 30097 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=SweetGrassCounty+MT |
| | Teton County | MT | 30099 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=TetonCounty+MT |