Post Offices in Riverdale, Maryland, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Kenilworth Post Office No Reviews Favorite Phone: (301) 699-3215Retail Hours Riverdale Post Office No Reviews Favorite Fax: (301) 277-6964Phone: (301) 699-1253Retail Hours