Post Offices in Monticello, Minnesota, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Monticello Post Office No Reviews Favorite Fax: (763) 295-4236Phone: (763) 295-2213Retail Hours Monticello Carrier Annex Post Office No Reviews Favorite Fax: (763) 295-4236Phone: (763) 295-2213Retail Hours