< PrevNext > 59. Walmart Bentonville, Ark. Share 2017 U.S.-Booked Air Volume: $70 million BTN estimates that retail giant Walmart's 2017 U.S.-booked air volume increased slightly in 2017, by about 1 percent. Revenue for the 12 months ending Jan. 31, 2018, increased 3 percent year over year to $500.3 billion. Operating income declined 10 percent to $20.4 billion as expenses increased. Walmart at the end of January had 11,718 stores open worldwide, including Sam's Club, 23 more than it had one year prior. The company had about 2.3 million employees worldwide, about the same as 12 months prior, with 1.5 million associates in the U.S.