Post Offices in Fullerton, California, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Sunny Hills Post Office No Reviews Favorite Fax: (714) 871-1243Phone: (714) 871-6618Retail Hours Commonwealth Post Office No Reviews Favorite Fax: (714) 879-9354Phone: (714) 879-2803Retail Hours Fullerton Post Office No Reviews Favorite Fax: (714) 879-7122Phone: (714) 525-1024Retail Hours Orangehurst Post Office No Reviews Favorite Fax: (714) 526-3138Phone: (714) 526-1028Retail Hours