Post Offices in Nantucket, Massachusetts, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Nantucket Post Office No Reviews Favorite Fax: (508) 228-7056Phone: (508) 228-4477Retail Hours Nantucket Carrier Annex Post Office No Reviews Favorite Fax: (508) 325-5887Phone: (508) 325-5987Retail Hours Nantucket Station 1 Post Office No Reviews Favorite Phone: (508) 228-4477Retail Hours