Post Offices in Cumming, Georgia, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Cumming Post Office No Reviews Favorite Fax: (770) 887-1828Phone: (770) 886-2388Retail Hours Lanier Carrier Annex Post Office No Reviews Favorite Fax: (770) 888-5325Phone: (770) 888-5357Retail Hours