Riverside Department of Public Social Services Food Stamp Office location is 11060 Magnolia Avenue Riverside, California, 92505. The Riverside Food Stamp Office refers to the California State agency that administers the Supplemental Nutrition Assistance Program (SNAP) in Riverside, CA. Commonly referred to as “Food Stamps,” SNAP benefits are a form of nutrition assistance provided to income-eligible households in Riverside through the U.S. Department of Agriculture (USDA). SNAP Offices provide benefits intended to reduce food insecurity and poverty by supplementing the food purchasing power of low-income households.