| | Beaverhead County | MT | 30001 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=BeaverheadCounty+MT |
| | Big Horn County | MT | 30003 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=BigHornCounty+MT |
| | Blaine County | MT | 30005 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=BlaineCounty+MT |
| | Carter County | MT | 30011 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=CarterCounty+MT |
| | Chouteau County | MT | 30015 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=ChouteauCounty+MT |
| | Custer County | MT | 30017 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=CusterCounty+MT |
| | Daniels County | MT | 30019 | | | | | nonmetro county (rural) | farm-dependent | https://maps.google.com/?q=DanielsCounty+MT |
| | Dawson County | MT | 30021 | | | | | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=DawsonCounty+MT |
| | Deer Lodge County | MT | 30023 | | | | | nonmetro county (rural) | federal/state
government-dependent | https://maps.google.com/?q=DeerLodgeCounty+MT |
| | Fallon County | MT | 30025 | | | | | nonmetro county (rural) | mining-dependent | https://maps.google.com/?q=FallonCounty+MT |