Post Offices in Guaynabo, Puerto Rico, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Caparra Heights Post Office No Reviews Favorite Fax: (787) 277-0887Phone: (787) 793-6187Retail Hours Guaynabo Post Office No Reviews Favorite Fax: (787) 272-8666Phone: (787) 720-3891Retail Hours