Post Offices in Portsmouth, New Hampshire, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Portsmouth Post Office No Reviews Favorite Fax: (603) 430-8931Phone: (603) 431-2871Retail Hours Portsmouth 2 Post Office No Reviews Favorite Phone: (603) 427-6270Retail Hours Portsmouth Naval Shipyard Post Office No Reviews Favorite Phone: (207) 438-3941Retail Hours