Post Offices in Wyandanch, New York, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Wheatley Heights Post Office No Reviews Favorite Fax: (631) 643-0411Phone: (631) 643-2912Retail Hours Wyandanch Post Office No Reviews Favorite Fax: (631) 643-0411Phone: (631) 643-3913Retail Hours