Incorporated in 1909, Walgreens Co., along with its subsidiaries, operates one of the largest drugstore chains in the United States. The firm specializes in selling prescription/non-prescription drugs and general merchandise, such as household products, convenience foods, personal/beauty care, candy, photofinishing and seasonal items. Located in Memphis, Tenn., some of its pharmacy services provided include retail, specialty, infusion, medical facility, long-term care and mail service. The firm operates nearly 8,046 locations across the United States, the District of Columbia and Puerto Rico.