Post Offices in Decatur, Illinois, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Decatur Post Office No Reviews Favorite Fax: (217) 428-4290Phone: (217) 428-4471Retail Hours Memorial Post Office No Reviews Favorite Fax: (217) 877-4523Phone: (217) 877-4361Retail Hours