Post Offices in Oak Ridge, New Jersey, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Jefferson Post Office No Reviews Favorite Fax: (973) 208-1726Phone: (973) 208-5872Retail Hours Oak Ridge Post Office No Reviews Favorite Fax: (650) 577-4430Phone: (973) 697-9073Retail Hours