The Walgreen Company (simply Walgreens, or sometimes archaically Walgreen) is an American company that operates as the second-largest pharmacy store chain in the United States behind CVS Health. It specializes in filling prescriptions, health and wellness products, health information, and photo services. As of August 31, 2016, the company operated 8,175 stores in all 50 states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands. It was founded in Chicago, Illinois, in 1901. The Walgreens headquarters office is in the Chicago suburb of Deerfield, Illinois. - Source: Wikipedia