Post Offices in Watertown, Massachusetts, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List East Watertown Post Office No Reviews Favorite Phone: (617) 924-1407Retail Hours New Town Post Office No Reviews Favorite Fax: (617) 926-3897Phone: (617) 926-2606Retail Hours Watertown Financial Post Office No Reviews Favorite Phone: (617) 924-1215Retail Hours