Why are so many Walmart's on Walnut St?

2110 W Walnut St Rogers, AR 

1790 East Walnut Street, Wateska, IL

1501 E Walnut St in . Paris, AR

2000 N Walnut St, Cameron, MO 

808 W Walnut St, Rogers, AR 

333 E Walnut St, Thayer, MO

2545 E Walnut Ave, Dalton, GA 

1600 W Main St, Walnut Ridge, AR 

1827 Walnut Grove Ave, Rosemead, CA

120 Walnut Street Philadelphia

930 N Walnut Creek Dr Ste 800, Mansfield, TX

110 WALNUT ST in Highland, IL.

These are just a few that I found easily. Many others didn't have an address for Walnut St. but it was close by.