Founded in 1901, Walgreens is a retail pharmacy chain that operates more than 6,600 locations in over 45 U.S. states, the District of Columbia and Puerto Rico. It was one of the first companies to introduce pharmacies connected through computerized network. The company operates nearly 6,000 drug stores, as well as worksite health centers and home care facilities. Through its division, Walgreens Health Services, it also operates specialty, institutional and mail service pharmacies. Walgreens pharmacies offer prescription refills and 24-hour store services. The company s pharmacies employ a team of pharmacists, nurses and care coordinators that provides consulting services related to managing medication side effects and monitors health symptoms. Its pharmacies also offer electronic, household, personal, cosmetic and baby products. The company makes contributions to support the treatment and cure of AIDS and funds community organizations, such as the American Cancer Society. With its corporate headquarters in Deerfield, Ill., Walgreens maintains a location in Buffalo Grove, Ill.