How big is Wal-Mart?

In the 2010 US Retailers annual report by the National Retail Federation, Wal-Mart ranks #1 out of the top 100 retailers in the US. Just how far ahead is Wal-Mart from the #2? Kroger, ranked second, had $78 billion in 2010 US retail sales. Wal-Mart had $307 billion. The scatterplot below shows the difference.

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The top 100 ranking is based on US retail sales, but does include figures for worldwide retail sales of the ranked stores. Wal-Mart had $421 billion in retail sales total worldwide for 2010.

If ordered by the aggregate worldwide sales, AT&T Wireless comes in second due to sales outside the United States. What are they selling that is so much bigger outside of the US market? The percent of international retail sales is amazing.

(click on image for larger view)