Post Offices in Chelsea, Massachusetts, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Chelsea Post Office No Reviews Favorite Phone: (617) 884-3578Retail Hours Chelsea Carrier Annex Post Office No Reviews Favorite Fax: (617) 889-1950Phone: (617) 884-9348Retail Hours