Phoenix DES Office Washington St is located at 5324 E. Washington St Phoenix, AZ – 85034. The Nutrition Assistance (formerly the Food Stamp Program) is Arizonas program for the Food and Nutrition Service (FNS) Supplemental Nutrition Assistance Program, commonly known as SNAP. The Nutrition Assistance program assists low-income families in purchasing nutritious food and prevent under-nutrition in Arizona. Individuals must apply for this program and provide all the required documentation.