Walmart is America's grocery king — and no one is close to stealing its crown

• Walmart is the biggest grocery retailer in the US by a long shot.
• The company reported more than $264 billion in US grocery sales last year, continuing its dominance.
• By comparison, Kroger and Albertsons combined sales were about $229 billion.

Walmart is famous for selling just about anything you can think of, but shoppers rely on the retail giant more for groceries than for any other category sold in the company's 4,600 US stores.