Post Offices in Gretna, Louisiana, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Gretna Post Office No Reviews Favorite Fax: (504) 367-2962Phone: (504) 363-4986Retail Hours Gretna Finance Post Office No Reviews Favorite Fax: (504) 367-2962Phone: (504) 362-7152Retail Hours