Post Offices in Oak Park, Illinois, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Oak Park Post Office No Reviews Favorite Fax: (708) 848-5196Phone: (708) 848-2440Retail Hours Oak Park South Post Office No Reviews Favorite Fax: (708) 848-2581Phone: (708) 848-6561Retail Hours