Post Offices in Columbia, Maryland, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List American Cities Post Office No Reviews Favorite Fax: (410) 381-2469Phone: (410) 381-4373Retail Hours Columbia Post Office No Reviews Favorite Fax: (410) 312-7442Phone: (410) 381-4373Retail Hours