Post Offices in Kalispell, Montana, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Flathead Post Office No Reviews Favorite Fax: (406) 755-0376Phone: (406) 755-0187Retail Hours Kalispell Post Office No Reviews Favorite Fax: (406) 756-0045Phone: (406) 755-6450Retail Hours