Final answer:
The described retail establishments that offer food and nonfood items and feature departmentalized aisles for self-service are called supermarkets.
Step-by-step explanation:
The single-story retail establishments that offer food and nonfood items in an organized departmental layout, typically on a self-service basis, are known as supermarkets. Supermarkets are major grocery stores that feature various departments including dairy, meats, produce, bread, cereals, and more. These establishments are designed to cater to a wide range of consumer needs under one roof, where each aisle contains hundreds or thousands of different products for customers to purchase.