Post Offices in Great Falls, Montana, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Charles M Russell Post Office No Reviews Favorite Fax: (406) 452-1537Phone: (406) 791-2562Retail Hours Great Falls Post Office No Reviews Favorite Fax: (406) 791-2570Phone: (406) 771-2165Retail Hours