Walgreens is an American pharmaceutical company which operates the largest drug retailing chain in the United States of America. As of 2023, the company operates 8,700 stores in all 50 states, the District of Columbia, Puerto Rico and the U.S. Virgin Islands. The company is headquartered in the Chicago suburb of Deerfield, Illinois. The Phoenix metro consists of Maricopa and Pinal counties, and includes more than 30 incorporated and more than 30 unincorporated towns and cities. As of 2020, Metro Phoenix had 4.8 million residents, making it the nation’s 11th largest metropolitan area. The largest city is Phoenix, which encompasses about 520 square miles and boasts a population of more than 1.6 million.