Post Offices in Harlingen, Texas, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Downtown Harlingen Post Office No Reviews Favorite Fax: (956) 423-1117Phone: (956) 423-1430Retail Hours Harlingen Post Office No Reviews Favorite Fax: (956) 423-1117Phone: (956) 423-1464Retail Hours