Post Offices in Passaic, New Jersey, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Passaic Post Office No Reviews Favorite Fax: (650) 577-4418Phone: (973) 779-6758Retail Hours Passaic Park Post Office No Reviews Favorite Phone: (973) 777-6917Retail Hours