Post Offices in Spring Valley, California, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List La Mesa Post Office No Reviews Favorite Fax: (619) 670-6085Phone: (619) 660-5728Retail Hours Spring Valley Casa De Oro Post Office No Reviews Favorite Phone: (619) 660-5728Retail Hours