Montana currently has two Intergroups that serve the State

Big Sky IG #09087
PO Box 21644
Billings, MT  59104
406-794-8591
​Email: BigSkyIG@gmail.com

Bitterroot IG#09279 
C/O Treasurer
150 Larch Hill Dr
Columbia Falls, MT 59912
Email: Bitterrootig@gmail.com
New & Events Subscribe Email: All-members+subscribe@BitterrootIG.groups.io