Post Offices in Woonsocket, Rhode Island, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Walnut Hill Post Office No Reviews Favorite Phone: (401) 766-8651Retail Hours Woonsocket Post Office No Reviews Favorite Fax: (401) 766-6631Phone: (401) 769-6853Retail Hours