Walgreens is the largest drugstore chain in the U.S., with more than 8,200 stores in all 50 states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands. Walgreens also offers convenient access to medical services through its Healthcare Clinic located in more than 400 select Walgreens throughout the country. Healthcare Clinics are staffed by board-certified family nurse practitioners who are specially trained to diagnose and treat a wide variety of illnesses and chronic conditions, order diagnostic tests and provide preventive care. The Walgreens partnership with WebMD offers customers additional digital health resources.