Walgreen Co. (Additionally commonly abbreviated as WAGS) doing business as

Doing business as

The phrase "doing business as" is a legal term used in the United States, meaning that the trade name, or fictitious business name, under which the business or operation is conducted and presented to the world is not the legal name of the legal person who actually own it and are responsible for it...

 Walgreens (without an apostrophe

Apostrophe

The apostrophe is a punctuation mark, and sometimes a diacritic mark, in languages that use the Latin alphabet or certain other alphabets...

), is the largest drugstore chain in the United States of America

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. As of August 31st, the company operates 8,210 locations across all 50 states, the District of Columbia and Puerto Rico. Founded in Chicago, Illinois

Chicago

Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...

 in 1901, and has since expanded throughout the United States. Walgreens is currently headquartered in the nearby suburb of Deerfield, Illinois

Deerfield, Illinois

Deerfield is a village in Lake County, Illinois, United States and is located approximately 25 miles north of Chicago, Illinois. A portion of the village is in Cook County, Illinois, United States...

.
Walgreens provides access to consumer goods and services and pharmacy, health and wellness services in America through its retail drugstores, Walgreens Health Services division and Walgreens Health and Wellness division.