Post Offices in Clarkston, Michigan, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Clarkston Post Office No Reviews Favorite Fax: (248) 922-9087Phone: (248) 922-1764Retail Hours Clarkston Carrier Annex Post Office No Reviews Favorite Fax: (248) 625-1084Phone: (248) 625-0648Retail Hours